Save 10% on STM Products with code STM10

STM Discount Codes and Promotions

We love giving you deals! You support us, we support you! Below you'll find our current promotions and discount codes and some FAQ answered!

Don't forget to make an account and take advantage of out Boost Reward Points! If you have any questions or concerns, as always, feel free to contact us.


Code "STM10" will save you 10% on STM Parts!
"STM Parts" are our own brand of USA made products.
See more here: STM Products

Exclusions apply.
The following STM Products are not eligible to be discounted:
• STM Turbo Kits
• STM Built Engines
• Huracan Titanium Exhaust
• STM Coil On Plug Kits
• OEM Timing Kits
• OEM Bolt Kits
• "Stopping Kits"

Discount codes cannot be combined.

Some products and manufacturers have strict pricing policies and are excluded from any discount codes. You may still apply your STM Boost Reward Points!

Products excluded from discount codes:

• APR Tuning
• Arma Speed
• BC Racing
• Buschur Racing
• DriveShaft Shop
• Forced Performance (Select Products)
* Manley
• Novitech
• S90
• Unitronic
• Vorsteiner
• Turbo Kits
• Engines
• Some large or oversized items

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.)

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!