i felt the same way when i bought the car it had the 15% od i am looking at a 5% sc pulley and a 5% jackshaft, but idk bc i am have ken make me a ic soon so i may leave the od alone. and the car is up for the winter, can you over od a sc?
ive heard 15% even 10% can be over kill on a stock intercooler
because the blowers generate so much heat
usually the stock m90s arent overdriven to more than 15
the mpx however ive seen it overdriven to like 45-50%
but everything must complement
exhaust heads cooling
i say if ur going to keep 15% a front mount would be great
or maybe a 10% combo with a double ic from KW and a fan
that could work very well since you already have other mods
i dont have another pulley to use yet only my 10%
other wise i would try the 3-5% and would tell you how that worked i also have a stock intercooler now with a fan
had a double but sold it to fund a front mount and i just spent the money on other things -.-
sometimes putting more boost doesnt mean more power
less boost but denser air works better
my car does feel alot more responsive and quick on the low rpms take offs etc
but then top end just feels heavy and unwilling to move with 10% and no tune