Has anyone had any experience with then.
I have seen it make 7 hp 3 ft/lb on a B20;

 

i dont know about extra hp but i know they will give you faster throttle response

 

i have all 3 Unorthodox Racing pullies on my B18B and i love them.... i wish i got them sooner. My brother and 2 friends have them on there SR20DE and DET's and think they are great as well.

 

have you had it on for a while? i have been hearing people say it will damage bearings, hurt the crankshaft....
harmonicbalance stuff, other people say no problem.

 

its no problem and is something i am definetly NOT worried about... you can take advice from other people, but i take advice from people who have actually done the mod not someone who read about it on some stupid website. Get the pullies... you will like them