I completely understand where you are coming from. Not that I've been in this situation before, bc I have never owned a 'new' car before. But I have had lots and lots of friends battle these issues. For example my friend Steve, he had a 2004Ford Lightning. He had just about every mod on it too. The thing was a rocket! But all of his mods were 'Ford Factory' mods i.e.--he bought them at the dealer. He was racing it on the highway against a 2005 M3 and he blew up the motor. A rod went right through the side of the block and had a whole big enough to fit your fist through! :cursing: Brought it to the Ford dealer and they said no way on covering the engine under warranty. It was literally brand new (less than 10k miles, this was in 04). He fought it and won, just because they were Ford Factory installed aftermarket parts.
I've had lots of friends with Subaru WRX's and STI's that had issues with dealers when aftermarket items were installed. Subaru is probably the worst when it comes to this stuff. They told one guy he couldnt get his drivers window fixed ( the regulator broke and wouldnt go up/down) because he had a cold air intake on it! :cursing:
When the new Nissan GTR's came out, Nissan was voiding warranties left and right for people that launched those cars out of race mode. When they did launch them 9 times out of 10 the transmission would blow (even if it was the 1st time launching it).
Car dealers are scandalous, I worked for a few selling cars and they will do whatever it takes to void a warranty. Just because if it something significant they usually cant recover costs (replacing the engine, major services, etc...) BS--yes very much so. If I ever do own a car with a warranty and i install mods on it, I will take them off before it goes into service!