anyway on the subject i have a 3.4 with 3in cat-less dp, and exhaust,cai,ngk's, accel wires running 93 w/octane booster every tank and maybe on a bad day hit 2 degrees kr with no pcm tune. i guess every car varies. like some people have more mods then me with the same pulley and are pushing 10-12 psi. I spike 9-9.5 and hold around 7-8 psi just varies i guess