Does installing a aftermarket exhaust system void the warranty on my car?
I worked at a dealership. It will not void your warranty. The only way any add on part will void your warranty is if they can relate to problem back to the aftermarket part. For example, if you put on the aftermarket exhaust system and your horn stopped working, they would replace the horn because it had nothing to do with the exhaust. In my opinion, I would not worry about the exhaust effecting your warranty. As mentioned above, the only thing it will void is the exhaust system warranty.
The only way that it can void the factory warranty if it causes another part of the car to fail. Most situations, it would do nothing to the factory warranty. So you should be ok to put a cat-back system on the car, but I wouldn't take the converter off under any circumstances (Ford turbo diesels are an exception)
