Who has upgraded their pulley system on their EJ25? Is it a noticible improvement in performance? Was it worth the cost of the pulley(s)? Did you keep it stock diameter or switch to underdriven? and did you have to change the belts? Let me know what you think! Thanks guys!

 

I have used an UOR underdrive pulley on my 93 and 2000, but switched to non-underdriven, lightweight Cobb pulley on the 2000 after some engine work. I was tired of the lights dimming at idle, especially with the heater on. The other advantage is that it uses a stock belt size, which is much easier to find in a fix than whatever belt size the underdriven pulley uses. As for a whole pulley set, I don't have any experience with them, but I'd imagine they'd be even better.

 

I think I am going the underdriven pulley route. Do you know the belt size i would need for this? How hard would it be to install myself? thanks!

 

Most kits, like the UOR, will recommend belt sizes/part numbers if they don't sell them with the pulley.