Just wondering which tune in the repository would be compatible with my 2003 GMC Sierra 5.3L Extended Cab Short Bed with bolt on mods. I only found a 2001 Sierra with a 5.3L, but it was regular cab, and a 2005 Sierra with 5.3L. Oh and do you guys think it is necessary to have a wideband with only bolt-ons such as: Long tubes, Y-pipe, single magnaflow, K&N FPIK, Ram Air, Throttle Body Bypass, Ported Throttle Body. Oh and will a wideband hook up to a V1?
Thanks