Free shipping on orders over $200 to the continental USA

STM Updates, Promotions and FAQ

March 12th Update:

Race season is coming! We have a ton of products in stock and finally starting to get caught up enough to develop new parts! This week we released the STM Evo 7/8/9 "Hard Core" Intercooler. In addition to the 3" Street Core and the 4" Race Core, the 5" Hard Core is for serious drag builds looking at 1200+ WHP. The Supra GR is on the lift, another Evo 9 project is on the plate, our new Audi RSQ8 is roaming the streets and the twin turbo Huracan was out making some noise today. If you need help getting your spring build together, just give us shout!

Below you'll find our current promotions and discount codes and some FAQ answered.
If you have any questions or concerns, as always, feel free to Contact Us.

To the Continental USA Only:

We currently offer free shipping on all orders over $200.00 to the lower 48 United States (excludes Alaska and Hawaii.) No code necessary.

If you apply a discount code and your cart total drops under $200, free shipping will not be activated. The total amount AFTER all discounts is what triggers the free shipping.

Exclusions apply. (Some oversize items have a flat-rate fee built in.)

Sorry, we are not currently running any sales or discount codes.


We apologize for any inconvenience, but codes must be redeemed separately due to the configuration of the system. This also includes Boost Points coupons. Only one code may be used per checkout.

Some products and manufacturers have strict pricing policies and are excluded from any discount codes. You may use your STM Boost Reward Points on these products though!

Products excluded from discount codes:


• aFe
• APR Tuning
• Arma Speed
• ATP Turbo
• BC Racing
• Buschur Racing
• Comp Cams
• DriveShaft Shop (DSS)
• English Racing
• Exedy
• Extreme PSI
• Fathouse Fabrications
• Forced Performance
• Fortune Auto
• JM Fabrications (JMF)
• Kelford
• Koyo
• LithiumPros
• MA Performance (MAP)
• Manley
• Novitech
• RaceQuip
• S90
• Tactrix
• Tilton
• Unitronic
• Vorsteiner
• WeatherTech
• Weld
• Weldon


• Some large or oversized items

Only one Code can be used at checkout.

Go to your Cart:
Review/Agree with Terms and Conditions
Go to Checkout Page or verify your PayPal or Amazon Pay account.

Select Payment Method:
Go straight to Checkout with your credit card, or use your PayPal or Amazon Pay.

If you select PayPal or Amazon Pay, you'll be redirected to their page to verify your information, then back to us. It's ok to click "Continue" on their verification page, this isn't the final step and you'll come back to us to finalize the details and discounts before you pay!

On Desktop:
Split screen display will show you your items on the right and you enter your code there and proceed.

On Mobile:
If you are on a mobile device, the layout stacks. Click the "Show Order Summary" at the top to enter your code and review all items. Only one coupon code may be used at a time.

All set! If you have any questions, feel free to give us a call!