Ask him He was knock free with the 3.4" and had a smoothflow 3.25" hanging around so we threw it on. Top of the gear saw 1.46*...Gotta flip the sway bar though...the SSAC DP smacked the crap out of it and saw 5.9* of false knock. As long as he just rolled into the throttle...it pulled like a damned raped ape for stock cam/rocker...I think its got mid 13's in it.