pacesetter here. if i have do all over again pacesetter wouldn't be my choice. my father's gtp have almost the same setup as my monte except his has slp headers. i notice the difference between the 2 headers. like on his when you punch on the gas the car just go. on mine it's kinda hesitate little bit. i don't get that smooth flow like on the gtp. even before i was xp cam, when all i had were pacesetter, cai, and stock exhaust my car felt slower than when it was stock. s&s is on my wish list well, unless i get ic first then i might keep pacesetter.