on my gt i ran the p1sc on my cobra i got the p1sc2.
gt pulley 3.6 9.6lbs
cobra pulley 4.0 9.2lbs.
the p1sc2 feels like it builds quicker and really pulls up top. cant wait to pulley it down seeing as im not even at half its capacity yet
You can't compare 2 valve to a 4 valve. That's like comparing apples to oranges.