STM Tuned Promo Codes and Coupons October 2025

STM Tuned

STMT Tuned is an online fashion retailer specializing in trendy women's clothing and accessories. The brand focuses on contemporary streetwear and casual fashion at accessible price points, targeting young fashion-conscious consumers. They offer worldwide shipping and regularly update their collection with new styles.

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Today's STM Tuned discount codes

TOP PICK

20% off

1104 uses

high

worked 6 days ago

20% Off Stm Closeout Deals at STM Tuned

10% off

103 uses

high

worked 6 days ago

10% Off Storewide at STM Tuned

5% off

8 uses

medium

worked 7 months ago

Score 5% off with promo code

5% off

6 uses

medium

worked 8 months ago

Take 5% off with discount code

Featured STM Tuned Products

Forge Wastegate Actuator for Evo 4-8

Forge Motorsport adjustable wastegate actuator for Evo 4/5/6/7/8 stock turbos. Made from CNC machined billet aluminum with a beautifully polished actuator top. Available with your choice of 3 spring pressures. Vehicle Fitment: 1996-2005 Evolution IV-VIII • Fits Evo 4/5/6/7/8 stock turbos ONLY Evo 9 Notes: This actuator will not fit Evo 9 style turbos. The Evo 9 Actuator is available HERE. Purchase Includes: (1) Actuator with spring installed Note: If you're not sure which spring to choose, please discuss it with your tuner. The Forge box will have a sticker showing which color spring is installed in the actuator. The springs are replaceable if you need to change later. Part Numbers: Installed Spring: FMEVACT-15aka FMPACEV8 Yellow (9-15 PSI Stock) FMEVACT-18aka FMPACEV8 Blue (14-18 PSI) FMEVACT-20aka FMPACEV8 Red (17.5-20 PSI)

USD 301.45

Mopar Supercharger Gasket Kit for 6.2L Hemi Hellcat TRX Trackhawk (68267539AA)

Genuine Mopar factory replacement supercharger gasket kit for the Hellcat 6.2L Hemi V8 engine. Fits TRX, Durango, Trackhawk and more. Vehicle Fitment:6.2L Hemi V8 (Hellcat Demon Redeye Supercharged)• 2021-2024 Dodge Ram TRX (6.2)• 2015-2023 Dodge Charger (6.2)• 2015-2023 Dodge Challenger (6.2)• 2021-2025 Dodge Durango Hellcat (6.2)• 2018-2021 Jeep Grand Cherokee Trackhawk (6.2)Purchase Includes:(1) Gasket KitNotes:Most of these parts are not available individually from Mopar, except the throttle body gasket. Part Number: Replaces: 68267539AA - Diagram images are for reference and may not represent your exact model.As always, please do additional research with your exact VIN to confirm part numbers. See more Mopar Parts

USD 369.76

ShepTrans Nissan R35 GTR Stage 3 HD Transmission Rebuild

The ShepTrans "One-K" transmission is purposefully build to handle 1000 ft lbs of torque! Improve the performance and reliability of your R35 GTR while enjoying the benefits of improved shifting and peace of mind with reduced drivetrain related issues! Vehicle Fitment: 2012-2024 Nissan R35 GT-R2009-2011 Nissan R35 GT-R models require additional upgrades to update the gearbox to DBA spec: • (3) Dodson Gear Selector Ring Upgrade (+$1050) • ShepTrans Viton Piston Seal Upgrade (+$300) Build Sheet: Stage 3 HD Rebuild Includes • Dodson H-D 1-6 Gearset • ShepTrans/Dodson 18 Plate Clutch • Dodson Forged A Basket • Dodson Forged B Basket • Dodson Piston Shaft Seals • Dodson FWD Gear Lock • Dodson Mechanical Lock #1 • Dodson Mechanical Lock #2 • ShepTrans FWD (ETS) Billet Ball Retainer • ShepTrans FWD Fluid • Dodson O-ring and Seal Upgrade Kit • Dodson Oil Pump Shaft Upgrade with Blueprint • Dodson Output Shaft End Float Shim • Dodson 2/4/6 Thrust Bearing Circlip • Dodson 1/3/5 Thrust Bearing Circlip • Dodson Selector Piston Shims (4) • 6 Neodymium Magnets • Dodson High Temp Rear Differential Oil Seal • Dodson Stainless Re-usable Internal Filter • OEM FWD Output Seal • OEM Rear Differential Axle Seals • OEM Nissan Transmission and Rear Differential Drain Plug Gasket • OEM Nissan Transmission and Rear Differential Fill Plug Gasket • Dodson Surge / Baffle Kit What's Included in the Optional Drag Pack? The Drag Pack upgrade includes: • Dodson Billet Drag Pan Kit • Dodson Rear Reduction Gears ( Drop Gears) • ShepTrans Billet Front Thrust Plate • GT1R Rear Differential Brace • ARP Rear Differential bolt upgrade What's Included in The Works Upgrade? • Wavetrac Rear LSD (+$1,995.00) • PRL Billet Rear Diff Cover/ With ARP Hardware (+$975.00) • Extreme Gearset Upgrade (+$3,450.00) (Please Note- These options can be added individually as well, please call us to confirm choices or for upgrade suggestions to best suit your GTR build) Important Notes: Must send in transmission for rebuild. Transmission core must be shipped to Shep directly. A core transmission in good condition is required as the foundation for the build. To avoid potential confusion or missing parts, we request that all transmissions arrive fully assembled. Any components deemed non-reusable will be replaced and quoted during the assembly process. Any required or optional upgrades are additional and will be quoted and billed separately. Freight shipping costs are not included and will be calculated independently. Build times for ShepTrans transmission rebuilds may vary; please contact us for the latest estimated completion time. Benefits of Upgrading the Transmission on a Nissan R35 GTR: The GT-R R35’s transmission benefits immensely from an upgrade, with added power and torque capacity that make it highly resistant to part failure under stress. This upgrade is especially useful for high-performance applications where durability and response are crucial. In addition to handling increased loads, upgraded transmissions deliver exceptionally smooth and rapid shifting, thanks to the GT-R’s dual-clutch system, which allows gear changes in as little as 50 milliseconds, giving it an edge in acceleration and responsiveness. The upgraded gearsets reduce shaft flex, leading to a more stable power delivery and a smoother driving experience. Moreover, protective additions such as a sump magnet kit work to capture metal debris within the transmission, preventing premature wear, while a reinforced aftermarket flywheel minimizes the risk of catastrophic flywheel failure. These combined enhancements make the GT-R better suited for high-stakes driving by preserving performance integrity and reducing the chances of costly part replacements. Shipping Times: Please note that transmission rebuilds are apx a 1-2 week turnaround. Please call to confirm a more precise ETA. Discounts:We are sorry, discounts and codes are not available for ShepTrans Products.

USD 23415.00

Mitsubishi OEM Bolt for Evo X Mount / Knock Sensor (MF911348)

Genuine OEM Mitsubishi factory replacement M8x30 bolt for the Evo X engine knock sensor and the GSR 5-speed engine mount bracket. Only one bolt is needed in each diagram. Sold individually, price is for one bolt. Vehicle Fitment: 2008-2015 Evolution X Purchase Includes: (1) Bolt Part Numbers: Diagram: Fitment: MF911348 02891 Evo X GSR 5-Speed Engine Mount Bracket MF911348 14974 Evo X Knock Sensor As always, please do additional research with your exact VIN to confirm part numbers. See more OEM Mitsubishi Parts

USD 4.77

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15% off

1 uses

medium

worked 8 months ago

Take 15% off with discount code

20% off

3 uses

medium

worked 8 months ago

Take 20% off with discount code

5% off

109 uses

low

worked 10 months ago

5% Off Storewide at STM Tuned

10% off

766 uses

low

worked 9 months ago

10% Off Stm 925 Lightweight Battery Kit For Evo at STM Tuned

More STM Tuned Products

Mitsubishi OEM Knock Sensor for Evo X/Ralliart (1865A040)

Genuine OEM Mitsubishi factory replacement knock sensor for all 4B11 Evo X and Ralliart models. The mounting bolt is available separately below. Vehicle Fitment:CZ4A 2008-2015 Evolution XCY4A 2009-2015 Lancer RalliartPurchase Includes:(1) SensorAlso Available:OEM Mounting Bolt (MF911348) Part Number: Diagram: Notes: 1865A040 14924 NTK PA66-GF30 Diagram images are for reference and may not represent your exact model.As always, please do additional research with your VIN to confirm part numbers. See more OEM Mitsubishi Parts

USD 242.34

Boost Logic Twin Turbo Kit for Audi R8 2020-2023 (BLTTR8)

The Boost Logic R8 twin turbo kit for 2020-2023 models is one of the best available with turbo options to support 800 to 2700 WHP! Titanium intake/exhaust, Vanjen connections, custom color options, TiAL valves and wastegates, Garrett cores and billet end tanks... it's got it all!Vehicle Fitment:2020-2023 Audi R8• Spyder models REQUIRE the Icebox Upgrade• Also available for 2017-2018 Audi R8• Prismatic Powder Color Options • There may be additional fitment info needed, but we will work with you to ensure you have the correct parts for your exact model.Boost Logic Twin Turbo Kit Includes:• Twin GTX 3582 turbos• Boost Logic air to water intercoolers (Garrett cores & billet end tanks)• Boost Logic Vanjen intercooler piping• Boost Logic titanium intake pipes• Boost Logic intake filters• Boost Logic titanium exhaust• Boost Logic water tank with additional temp sensor bung• Boost Logic dual heat exchangers specifically purposed for water cooling• Boost Logic heat shielded lines• Boost Logic braided hose for water system• TiAL BOV and wastegates R8 Turbo Kit Options: Gen II GTX 3582 The standard turbo capable of 1700whp while also having great spool at the 800whp base level G35-1050 This upgrade is capable of 1800whp with the latest Garrett technology. G40-1150 This upgrade is capable of 2000whp with the latest Garrett technology. G42-1200 This upgrade is suggested for built motor cars, capable of 2300+ whp. G42-1450 This upgrade is suggested for built motor cars, capable of 2500+ whp. G45-1600 This upgrade is suggested for built motor cars, capable of 2700+ whp. R8 Turbo Kit Upgrades: R8 Front Icebox Upgrade (+$1699) *Required for Spyder modelsaka Frunk Water Tank T51r Mod (+$1000) This makes the turbos whistle when spooling, similar to the discontinued HKS T51R series turbochargers. Powdercoat (+$600) Choose a gloss powdercoat color for the intercoolers and compressor housings. Prismatic Powder Color Options Please let us know in the notes section of checkout what color you would like - for example "Illusion Purple PSB-4629" Black Ceramic Coat (+$600) This option will add a black ceramic coating to the exhaust housings. Helps to contain heat and keeps the housing looking great. Additional Suggestions (Sold Separately)• Heat Management Package• Header Blankets• AMS Manifold Seal Kit (Recommended if you are running the stock manifold)More from Boost Logic:The titanium exhaust and billet endtank intercoolers with Garrett cores are designed to provide maximum performance and reliability. The titanium exhaust provides an improved exhaust flow that helps to reduce backpressure and increase horsepower. The billet endtank intercoolers are made from high-quality materials that ensure durability and longevity. These intercoolers are designed with Garrett cores, which are known for their excellent heat dissipation and performance capabilities and rated for power levels over 2,000hp!Another highlight of this turbo kit is its amazing water pump, which helps to maintain consistent coolant flow and temperature, even during high-performance driving. The dual heat exchanger system keeps intake air temps low, which helps to improve engine efficiency and power. The fully vbanded turbo kit connections ensure a secure and leak-free fit, which helps to prevent any potential engine damage or turbochargers.One of the standout features of this turbo kit is its bolt-in oil feed and return assembly. Unlike other kits that require extensive modifications or machining to install, the Boost Logic R8 Turbo kit requires no cutting, drilling or any other modifications to the vehicle or engine. This makes installation quick and hassle-free, and also helps to maintain the integrity of your vehicle.The kit is fully customizable, with custom powdercoating options available to match or accent your vehicle. You can choose from a variety of colors to create a unique and personalized look. Additionally, the kit features our exclusive heat management system, which helps to keep engine bay temperatures low and prevent engine bay fires. The low engine bay temperatures help to increase engine efficiency and power, while the dual heat exchanger system keeps intake air temps low, which helps to improve engine performance.Overall, the Boost Logic R8 Turbo kit is a high-performance upgrade that promises to deliver impressive results. With its advanced features, cutting-edge technology, and customizable options, this kit is the perfect choice for anyone looking to take their driving experience to the next level.The kit is fully customizable, with custom powdercoating options available to match or accent your vehicle. You can choose from a variety of colors to create a unique and personalized look.

USD 29348.00

Gates Racing RPM Accessory Belt for DSM 4G63

Gates Racing black Micro-V RPM accessory belts are available for the 1990-1999 1G/2G DSM Eclipse, Talon and Laser models. All part numbers listed are for an OEM replacement size. If you have aftermarket pulleys, the diameter of your setup may be altered. Please do all your research to confirm which part number you need.The RPM line was specifically designed for supercharged applications, but the following belt sizes are compatible with 4G63 engines. The belt construction is unyielding and less "stretchy" than other compounds. *Limited Quantity* The Gates RPM line is being discontinued, but we do also offer the standard replacement Gates Accessory Belts for DSM 4G63. Part Number: Belt: Fitment: Availability: K040372RPM A/C Belt 1990-1994 DSM *Limited Quantity* K040365RPM A/C Belt 1995-1998 DSM *Discontinued* K040370RPM A/C Belt 1999 DSM *Discontinued* K040390RPM Alternator Belt 1990-1995 DSM *Limited Quantity* K040390RPM Alternator Belt 1996-1997 DSM (Manual Transmission) *Limited Quantity* K040384RPM Alternator Belt 1996-1997 DSM (Automatic Transmission) *Discontinued* K040384RPM Alternator Belt 1998 DSM *Discontinued* K040385RPM Alternator Belt 1999 DSM *Discontinued* K040274RPM Power Steering Belt 1995-1999 DSM *Limited Quantity* N/A Power Steering Belt 1990-1994 DSM - Belt PN Sizes:For example:K040372RPMK 04 0372 RPM4 Ribs37.2" LongRPM Racing SeriesPurchase Includes:(1) BeltMore from Gates:The Gates RPM Micro-V accessory and serpentine belts feature the most advanced technology, resulting in lower heat, noise, vibration and belt slip. Nylon-fiber reinforced under cord gives way to an exact-fit precision ground belt profile. Two layers of adhesion for increased durability surpass strict OEM dimensional tolerances.• Nylon-fiber reinforced undercord• High-modulus, low stretch aramid or polyester cord• Advanced, exact-fit precision-ground belt profile• Strict OEM dimension specifications• Two layers of adhesion for increased durability"Gates RPM (Racing, Performance, Muscle) is a new, no compromise belt built specifically for supercharged applications.Whereas 99% of all belts on the market today use a polyester tensile cord, the RPM series uses an aramid tensile cord. This is the same fiber found in bulletproof vests and is 10x stronger than steel and 5x less elastic than polyester. When polyester heats up (which it does even from normal use) it will stretch out. As you can imagine, when that belt stretches out you experience belt slip and boost loss. Eventually the elastic properties of the polyester will fail and the belt that was once 100” will stretch to 100.25”, at which point the tensioner can no longer compensate for the stretch and generally results in belt failure.Due to the strength and minimal elasticity of aramid fiber, the RPM series of belts will not stretch which allows the belt to maintain its true length throughout its service life. This results in more consistent boost and in some instances, users have reported a 1-2psi increase merely from switching from HD belts to RPM belts. We actually have some user submitted under hood video on our Instagram page (GatesRPM) that clearly demonstrates the difference between polyester and aramid corded belts.Another main benefit of the RPM line is the use of two layers of adhesion gum. These layers create a sandwich around the tensile cords which transfers the load to the strongest part of the belt; the jacket (or smooth backside of the belt). FleetRunner HD belts got a reputation for strength because they use one layer of adhesion gum, standard micro-v belts forgo any adhesion gum.RPM belts also utilize a patented rubber compound with the highest coefficient of friction available and are built in common OE supercharger sizes as well as many sizes used with aftermarket setups. The RPM line has expanded to 299 part numbers with new numbers being added every quarter." See more Gates Products

USD 60.85

ACL Race Rod Bearings for 4G63 7-Bolt

ACL Race Series rod bearings for the 4G63 7-bolt DSM and Evo 4, 5, 6, 7, 8, and 9. Includes a full set of 8 rod bearings. Vehicle Fitment: 7-Bolt 4G63 1996-2006 Evolution IV V VI VII VIII IX 1992.5-1999 Eclipse GST/GSX 1992.5-1998 Talon TSi 1992.5-1994 Laser RS Includes: Set of 8 bearings Race Series Photo is for reference Part Number: Size: 4B1185H-STD Standard 4B1185H-.025 .025mm Oversized 4B1185H-.25 .25mm Oversized 4B1185HX-STD Standard w/ Extra Oil Clearance (.001") See more ACL Products

USD 35.07

10% off

595 uses

low

worked over 1 year ago

10% Off Storewide at STM Tuned

10% off

179 uses

low

worked 10 months ago

10% Off Storewide at STM Tuned

5% off

305 uses

low

worked about 1 year ago

5% Off Storewide at STM Tuned

10% off

69 uses

low

worked almost 2 years ago

10% Off Hawk Performance Products at STM Tuned

Sustainability Score

42%

STMT Tuned shows limited transparency regarding their supply chain and manufacturing processes. While they have introduced some recycled materials in their packaging, their overall environmental impact remains concerning. The brand lacks clear policies on labor conditions and animal welfare. Their sustainability commitments appear superficial without substantial evidence of implementation or third-party verification.

About STM Tuned

3.0 (2)

FAQs

: Major sales typically occur during Black Friday (November), end-of-season clearances (January and July), and occasional flash sales throughout the year. Sign up for their newsletter to get notified about upcoming sales.
: The best deals can be found during Black Friday sales and end-of-season clearances. Additionally, shopping mid-week (Tuesday-Thursday) often gives you better access to new arrivals and full size ranges.
: Yes, students can receive a 10% discount on full-priced items with valid student ID verification through Student Beans.
: Subscribe to their newsletter for exclusive discount codes, follow their social media accounts for flash sales, and check their website banner for ongoing promotions.
: In the past month, STM Tuned has launched 7 new promo coupons for shopper discounts. This indicates that STM Tuned provides regular opportunities for customers to save money on their purchases.
: On average, STM Tuned provides 3.5 discount coupons each month. Based on historical data, the average time between STM Tuned coupon releases every 9 days. However, this rate depends on various factors such as seasonal promotions (Black Friday, Cyber Monday, etc.), product launches, or other marketing initiatives. To stay informed about upcoming discounts and promotions, we recommend checking STM Tuned website regularly, subscribing to email newsletters, and following them on social media.
: STM Tuned is offering 2 working store-wide codes, however they are also offering 17 additional discount codes with a best discount of 20% off
: terra.coupons is the #1 provider of discount codes for your favorite retailers, such as STM Tuned. As a crowd-sourced platform for coupon codes, we accurate codes for over 10,000 stores. Save time and avoid expired codes by checking terra.coupons for the latest STM Tuned discount codes.

Curated by

Aleksa P.

Deal Curator

Last updated October 2025

Aleksa is a deal finder from the tech-savvy city of Austin, Texas. A keen coder by day and a discount guru by night, Aleksa checks back regularly to update you with new deals.

Latest STM Tuned coupon activity

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From the blog

2025-04-29

STM Tuned Promo Codes and Coupons October 2025

STM Tuned

Today's STM Tuned discount codes

Featured STM Tuned Products

Forge Wastegate Actuator for Evo 4-8

Mopar Supercharger Gasket Kit for 6.2L Hemi Hellcat TRX Trackhawk (68267539AA)

ShepTrans Nissan R35 GTR Stage 3 HD Transmission Rebuild

Mitsubishi OEM Bolt for Evo X Mount / Knock Sensor (MF911348)

What STM Tuned coupons are available today?

More STM Tuned Products

Mitsubishi OEM Knock Sensor for Evo X/Ralliart (1865A040)

Boost Logic Twin Turbo Kit for Audi R8 2020-2023 (BLTTR8)

Gates Racing RPM Accessory Belt for DSM 4G63

ACL Race Rod Bearings for 4G63 7-Bolt

Sustainability Score

About STM Tuned

FAQs

Curated by

Aleksa P.

Latest STM Tuned coupon activity

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