Does anyone have this in their car? I have subs in my car and im not sure if the underdrive or even standard pulley will mess them up. Any info would be great

standard pulley as opposed to the underdrive pulley I think would be okay. You're just talking about replacing the crankshaft pulley,right?

https://g35driver.com/forums/v36-eng...elp-techs.html

hope my thread helps your decision out a little.

you gain about 1 whp from the pulley and for me caused engine damage.