Dynomax "Lifetime" warranty

"Please go to Dynomax.com. Click on TECH SUPPORT. Then click on warranty /
guarantee.

Basically the covered Dynomax premium product will be replaced at no charge
as long as you own the vehicle and the product was used under normal
operating conditions. Replacement does not include labor. There is a form
on the web site that must be filled out and the consumer will probably need
to have the receipt from the original product purchase.

There is also the 90 day safe & sound guarantee which is a pretty good
deal."