Will a modified exhaust void factory warranty?

[AzBob_imp]

The manufacturer needs to prove that your modification (or neglect of required, documented maintenance) was the direct cause for the failure and not a defect in design or manufacture to deny a warranty claim in the U.S.

A manufacturer or dealer is not going hire outside consultants to do an in depth study to determine the cause and provide you with a written report. The real issue is that if you disagree with the outcome, it is upon you to take the dealer to court with your own $proof$ to force a claim to be covered. MANY of the automakers deny warranty claims with no "proof."

Nobody said anything about outside consultants or written reports. They built and designed the thing. It would take them all of about 20 minutes to get a good idea if an owner's modification contributed to a warranty claim or not. It behooves the manufacturer to ameliorate any valid warranty claim.

Bringing the manufacturer to court on a civil matter like this costs the plaintiff zero dollars if they win the case. Honda and other manufacturers know this, and besides the cost of the repair, they would owe the court costs of the plaintiff.

That being said, I have never had a warranty repair denied by any manufacturer in 20+ years of vehicle ownership, and I've had warranty repairs > $10,000.