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Long tube headers, high-flow cats and aftermarket exhaust will only void your warranty on your headers, cats, and exhaust system. Obviously, if you get this stuff installed and there's an exhaust leak, and you take it to the dealership, they will not cover it under warranty.

The warranty period has expired. The defect or part is not covered. The product failure is due to misuse or lack of proper maintenance. You have made significant alterations to the product, affecting its performance.

A flag that is too big will void your warranty (yes - see Cyril Huze Blog for this one) Getting your motorcycle serviced anywhere than a dealership will void your warranty. You have to use genuine motor oil sold by our dealership or you will void your warranty.

Technically, you can void the warranty if you or an unauthorized entity (instead of a Harley dealership) installs Screamin' Eagle parts or other performance parts. However, it often comes down to the individual dealership.

Simply using an aftermarket or recycled part does not void your warranty. The Magnuson-Moss Warranty Act makes it illegal for companies to void your warranty or deny coverage under the warranty simply because you used an aftermarket or recycled part.

Yes. they can. it is mentioned in your owner's manual no less than 5 or 6 times that if you install non-epa compliant parts (tuner, exhaust, cams, etc) in your bike that the 'powertrain' warranty is null and void.

Will muffler delete void that warranty? Well, No. With the Magnuson-Moss Warranty act, a muffler delete will not void the warranty of your car. For dealers to void your warranty, they must prove that the problem is directly caused by your modification.