I hear some of the best combinations for garunteed high 12 low 13's is a an PCM tuning, Intercooler, pulley, Headers, cat-back, CAI, & Drag Radials. but with drag radials, I hear the stock LSD is pretty week and might shatter, like our infamous 10-bolts
I do not recomend SLP headers. I hear The Other Guys have the best ones on the market right now. And the SLP Loudmouth sounds like ****.