Did a search and found lots of info. on the lower pulley but not much on the upper.
I just ordered one and was wondering if those of you running the upper have had any problems and what type of power gains you noticed. I read somewhere they dropped .2 off 1/4 times.
I assume you get the same 2lb. gain as you would from a lower pulley? Im also gonna have JDM install the lower @ FFW in Ennis, but will run the stock upper on the street unless Im racing.

Thanks for your time!

 

I have the upper and JL Lower. I noticed about 1.5lbs with the upper and 3lbs. with the lower. If I were only going to run one pulley, I would just run the lower.

 

I'd agree with above statement.