You will notice a little bit of improvement in performance, but you'll have problems with charging from your alternator. (I speak from experience)
If you install underdrive pullys, I HIGHLY recomend doing one of the following....
1) Only get the crank and/or waterpump UNDERdrive pullys and get an OVERdrive pully for the alternator.
2) Upgrading to the G3 alternator (130amps). (you may still have to get an overdrive pully for this one, I had to)
Choice 1 is the easiest and cheapest. Choice 2 will be better if you have a large stero system you would like to keep thumping.
I recomend getting March Performance pullys.
If you decide to upgrade to the G3 alternator, let me know and I can provide you with detailed instructions on how to do this.
