We challenge you to try our performance mufflers* risk-free for 90 days - if our products don't meet the challenge, call us for your money back. We'll even pay to replace them!
Try qualifying DynoMax products* for 90 days. We guarantee you'll experience the DynoMax performance difference! If, for any reason, the qualifying products don't live up to your expectations within the first 90 days, replace the products and we will refund your original product's purchase price, plus labor (up to $50 per exhaust system). We're that confident you will be satisfied with DynoMax performance products!

Warranty claim information or assistance may also be obtained by calling: 1 (734) 384-7898 Limited Lifetime Warranty applies to qualifying DynoMax products, including Ultra Flo SS, Ultra Flo Welded and Super Turbo mufflers.

Warranty claim information or assistance may be obtained by writing:
Warranty Department / Tenneco
One International Drive
Monroe, MI 48161

DynoMax headers and Thrush mufflers carry a 90-day warranty against defects in materials or craftsmanship.
Any modifications to the product or use inconsistent with the intended application voids this warranty. Parts and labor are not covered.

Tenneco Inc. warrants qualifying DynoMax products against defects and wear-out when used on private passenger cars and light trucks under normal operating conditions for as long as such purchaser owns the vehicle on which they were originally installed, and Tenneco continues to make the warranted product(s). Tenneco's obligation under this warranty is limited to replacement of the worn-out or defective product in accordance with this warranty. Cost of removal and installation are not included, and any incidental and consequential damages are excluded under this warranty. This warranty does not apply to products which have been modified, improperly applied or installed on vehicles used for commercial or racing purposes. To make a claim under this warranty, return the worn-out or defective product and a copy of your current Vehicle Registration or current Insurance Certificate with the dated original receipt, to the dealer from whom it was purchased or a Tenneco dealer, for verification and exchange under this warranty. This warranty gives you specific legal rights, and you may also have other rights, which vary from state to state. Any implied warranties you may have under state law are limited to the same duration as this warranty. Some states do not allow limitations on how long an implied warranty lasts or do not allow the exclusion or limitation of incidental or consequential damages, so the above limitations and exclusion may not apply to you. Tenneco will contact warranty-serviced consumers to conduct customer satisfaction surveys relating to product and warranty service.