Refund policy

We have a 30-day return policy, which means you have 30 days after receiving your item to request a return. Additionally our Restocking fee is 20% on all products.

To be eligible for a return, your item must be in the same condition that you received it, i.e unused, and in its original packaging. You’ll also need the receipt or proof of purchase.

To start a return, you can contact us at returns@atsdiesel.com. Please note that returns will need to be sent to the following address: 

ATTN:

ATS Diesel Performance
5293 Ward Rd. Unit 11
Arvada, CO 80002

If your return is accepted, ATS will send instructions on how and where to send your package. Items sent back to us without first requesting a return will not be accepted. Customer maybe responsible for the return shipping costs.

You can always contact us for any return question at orders@atsdiesel.com.

Damages and issues
Please inspect your order upon reception and contact us immediately if the item is defective, damaged or if you receive the wrong item, so that we can evaluate the issue and make it right. Customers must inspect freight prior to accepting or signing for it. Any damages/concerns must be noted at time of delivery.

Exceptions / non-returnable items 

Due to the nature of performance, heavy‑duty, and specialized components, the following cannot be returned:

• Electronics and tuners – including but not limited to engine tuners, programmers, monitor devices, and electronic modules, once opened or installed.

• Software, custom tuning, and calibration files – downloadable or emailed tunes, licenses, and custom calibration services are final once delivered.

• Special‑order and custom‑built components – items built to your specifications (e.g., custom transmission packages, billet converter builds, specialized clutch packs, or made‑to‑order driveline parts).

• Opened or Installed parts – any component that has been installed, used, heat‑cycled, damaged during installation, or is missing original seals and packaging.

• Fluids, lubricants, and chemicals – including oil, additives, cleaners, and aerosols for safety and contamination reasons.

• Hazardous materials – batteries, pressurized containers, and any items classified as hazardous or flammable.

If you are unsure whether your part qualifies for return, contact us before ordering or installing it. We are happy to confirm return eligibility on a case‑by‑case basis.

Exchanges
The fastest way to ensure you get what you want is to return the item you have, and once the return is accepted, make a separate purchase for the new item.

European Union 14 day cooling off period
Notwithstanding the above, if the merchandise is being shipped into the European Union, you have the right to cancel or return your order within 14 days, for any reason and without a justification. As above, your item must be in the same condition that you received it, unworn or unused, with tags, and in its original packaging. You’ll also need the receipt or proof of purchase.

Refunds
We will notify you once we’ve received and inspected your return, and let you know if the refund was approved or not. If approved, you’ll be automatically refunded on your original payment method within 10 business days. Please remember it can take some time for your bank or credit card company to process and post the refund too.
If more than 15 business days have passed since we’ve approved your return, please contact us at orders@atsdiesel.com.