I just put the 3 l Whipple on my 5.3 and couldn't be happier. I have to believe with labor, the cost is similar if not less to what you are looking at doing and the drivability hasn't changed a bit. I did heads, cam and intake on my Trailblazer SS and the cam caused drivability issues I did not like on a daily driver and made less HP on the LS2.