Originally Posted by Jason 98 TA
Good questions for sure. I haven't seen anyone try a pulley swap without tuning. Maybe someone here will jump in with experience trying that. The lower pulley is easier to do than a upper & can be returned back to stock very very easily. 93 octane is always important with a boost car no doubt!
See my sig.
2012 ZL1 #1092
Black on Black
Mods: 9.55 lower pulley, Kooks LT w/cats, FIC850's, CAI
"Race" Tune - 645rwhp/635rwtq