Brand new Subaru owner here. 600 miles on it and i already love it! Have a 5 year warranty on it however i'm worried about voiding warranty if adding mods such as exhaust, cold air intake, and tuner. However, my question is, what is the best exhaust to put on your car. I'm not just talking brand. Wondering what produces the best sound and best performance whether that be cat back, turbo back, j-pipe, etc. If you also want to add brand that would be greatly appreciated.