[Trucks!]

Yeah i know what you are talking about, i have 2.5 inch pipe from the Y at the headers to a "Cherry Bomb" (thats what some call it) magnaflow highflow cat. Then i have dual 2.5's running to the rear and exiting. My truck is realatively quiet at idle, but when you get on it it roars and is really loud. and when you rev it it kinda crackles and winds down, plus mine gave me about 1.5 more mpg, on the highway, nothing much really in the city.