The following applies specifically to ATS Diesel Performance cores (prefix APF-). Click this link for instructions on How to Return All Other Cores.

ATS Diesel cores must be returned directly to ATS Diesel. Please follow the instructions below.

Package the Old Parts

  1. Drain all the fluids.
  2. Secure the old part in the same container the new part arrived in.
  3. Label the container for shipment.

Return Address

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

Schedule a Pickup

  1. Contact ATS Diesel Performance at 1-800-949-6002 (x500).
  2. Tell them you are returning a core.
  3. Provide the following information:
    1. Original invoice number
    2. Unit serial number
    3. Pickup address
    4. Your phone number
    5. Your email address

What You Should Expect

  • ATS Diesel will arrange for pickup.
  • After the core is received and inspected, we will issue your Refund (please allow 2-3 weeks).

If you have questions or concerns, please contact ATS Diesel Performance at the number listed above.


  • For the best service, please return your core within 30 days of purchase.
  • You are responsible for the cost of return shipping.
    • ATS Diesel will provide special rates.
  • In accordance with state and local laws, sales tax charged on core value may be non-refundable.
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