I was at a dyno session and one of my good friends had his 90 LX there.  Pretty much stock, except exhaust.  He got a chance to switch pullies, 11hp and that was on the street pullies, needless to say I was shocked, I wouldn't get the race pulley if you want to drive it on the street at all with it on.  There is a reason while it's called a "race only" pulley.  
