Agreed, the factory exhaust is silent. I gotsta have it. My question is does it affect the warranty? Also, do the air induction and the OBD setups affect the warranty?
The question of warranty on new cars is one that comes up often.
The answer is of course "it depends..."
First - many dealerships actually install our exhausts, intakes, and tunes for customers, while other dealerships are 100% against aftermarket parts. So, I would suggest feeling out the service department at your local dealership, since they are the ones you are going to have a long-term relationship with.
Second - a warranty isn't a black and white thing. A dealership cannot "Void" your entire warranty because they find an aftermarket part. What they would have to do, according to the Magnussen-Moss act, is prove the aftermarket part caused a failure before they could deny warranty coverage on that failure. More generally, what often happens is they would blame an aftermarket mod for a failure on a particular system, even if they don't have proof. For example, a tuned ECU, which increases boost, could be used as reasonable grounds to deny coverage for a turbo failure, but would not be reasonable grounds to deny coverage on a brake, suspension, or transmission issue.
Third - and this is just my opinion based on interactions with dealerships across the country; I don't get the impression that Alfa is going out looking to void warranty coverage, or that aftermarket performance parts have caused major warranty issues.
Out of the common aftermarket mods, the ECU tunes are most likely to cause warranty issues - however with the tunes for the 2.0T engine you are easily able to re-flash your stock ECU programming back to the car before taking it in to the dealership. Unfortunately, the QV is a whole other level of complexity so this isn't an option.