Just got a hold of a none stock 04 blk L. Its raining this weekend.but im spendin all weekend next week installing a few things. Already got a flowmaster catback. I know its not the best for power but i like the sound. Im installing a offroad midpipe, iridium plugs, 6 lb lower, jlt cai, n a predator tune. What kind of power should i look for with the pulley n without?