Since my brother cut his muffler out on WOT his turbo whistles loud. I helped him put a S&B, but not very good quality or should I say fitmit. With those 2 things done, not much performance gain he can feel. He's waiting to get new wheels with small lift and a programmer. Urghhhhh
I'll cheat and jump on it and once he starts to catch up I'll let off... HEHE
