What's a better combo, a 2.93 upper with a 4 pound lower or 2.76 upper only. On a stock unported eaton. Will I need a boastapump or bigger injecters, were can I get a good tune now that bob is gone. What kind of boost and tq number with both combos. Mods are jlt intake,catted xpipe,borla stingers,daul pass intercooler and bigger tank. car has 25000 miles. I have the 2.93 and could buy the 4 pound lower or sell the 2.93 for a 2.76 Whats the best cooling head mod . Sorry about all the question thanks Ron