Changing out the exhaust does not void the warranty, but be sure whoever you choose has a system that will not cause the CEL to come on (normally only happens when the cat is removed or upgraded). Also, kind of obvious, but don't expect Porsche to warrant the replacement exhaust system, nor will they repair under warranty any damage caused by said exhaust system (highly unlikely). Also, most folks tend to do a performance tune when installing performance exhaust, performance tunes will invalidate your warranty. Lastly, keep your old exhaust for when you go to sell your Porsche, the new owner might prefer that to the performance exhaust, or you yourself might get tired of it and want to switch back to factory.
