We are so confident in the quality of our repair kits, that we offer a guarantee that our repair kits will not fail due to corrosion, cracking, or splitting for 5 years/50,000 miles, whichever happens first. This warranty does not cover damage that may be the result of improper use, including, but not limited to: road damage, overheating, missing hangers, broken motor mounts, etc. If for any reason our repair kit fails under normal use, we will replace it free of charge. Your original invoice and picture of the failed repair kit while still installed will be required for warranty. Our warranty does not cover shipping, labor costs or other installation costs. It also does not cover any incidental or consequential damages.