Really, its drivers error, lack of tune, but STILL.  Last time I was at the rack, 1 350z, 2 G's.  One Turbonetics kit, goign 14.1's @104  Other was TT goign 14.X @101, 102.  The N/A car had just and intake, and exhaust (no spacer, which is good for another 20whp) and went 13.6@99-100mph