I have a y-pipe, exhaust, custom intake, oil cooler. I also am running 2 12inch subs with a 600 watt amp. I also have an underglow kit and strobes coming in.
I was wondering if I should still go for an under drive pulley? Does it make a huge difference in hp? Would I need anything else go go with the under pulley?
What you guys think?

 

Well, they say that it adds about 8hp. I just installed one in my 96 5spd and I definately felt a difference in acceleration. Also, the throttle response felt alittle quicker so I was pleased. But, it's up to you whether you're willing to spend the money or not.

 

I don't have one so I can't say from experience, but I have done lots of searching and it seems like reviews are mixed, at best. Some say it helps a lot, others say it was the worst bang for the buck they spent their money on. I would recommend this only if you've done everything else within reason (excluding S/C, turbo) and have the money to drop.

 

I agree with what he said. I'm pretty much ready for a turbo so this was the last mod I could find to do before going over to forced induction. I would recommend it though.