Magik man, (I am not starting crap here) the drivers of the pullied Cobras must be new to it, like me. A pullied Cobra should running in the mid to high 11s. Stock Cobras run high 12s (where you are running). Your 12.8 1/4 mile just doesn't seem like it should "run with MOST pullied Cobras." I put down 466 rwhp 473 rwtq with just a pulley, tune , catback and intake.