Okay i heard good and bad from underdrive pulleys. give me some personal info. would you or wouldn't you. does it affect the timing. would it be okay for nitrous. :shrug:
doesn't affect timing, that is controlled by the EEC. The only thing U/Ds do is slow do the accessories. Unfortnately, IIRC, the only ones available for our car, replace the crank pulley, which from what i've heard isn't good for harmonics. We have enough problems with crank whip, I don't know if I'd go that route. I'd just invest in the DMD (Dual Mode Dampner).
As for the GoGo juice, it wouldn't affect it............