A Dp and PLOG with some other BS I safely run a 3.6. Not as much fun as a 3.4 but makes people scratch there heads still and my motor sleeps better. Plogs need rewelding but that **** is cake. Or just go ballz deep and do EVERYTHING for a 3.4. The kid by me with the 3.4 and no mods finally looked like a jackass for not listening to me when his GTP just got sold to U-Pull-it for $400 cuz dat went kaaaaaBOOM