Just purchased a 02 L. Already had a 4# pulley and diablo predator tuner. I will be installing a Air Raid filter and Flowmaster cat-back tomorrow. When I bought the truck the guy said that when he installed the predator he told the factory that he was running the 4# pulley and they set up a program for that setup. Should I get the L on the dyno and check timing and a/f ratio? What type of hp and tq #'s should I expect? I live in WI any good tuners around?