ive seen HKS exhaust systems on an LS before, but i didnt like the look and i dont want my car to sound like a ricer. Flowmasters has different stage kits for sound, so it wont sound like an F150. im replacing my whole piping system from the headers back. the has potential to be quicker but with the restrictions, it doesnt have a chance. i dont care about the sound, im into power.