Got my UR pulley installed today. My bf and his buddy put it in. A sidenote for anyone who is going to do this. Go ahead and just file/grind down the timing chain cover, no matter what. There really isn't a way to check to see if it will rub or not without basically installing it and then pulling it back out with the pulley puller. Well mine rubbed so they actually ended up installing it twice. But it was pretty straight forward. The first time took them 45 minutes with 2 guys, air gun/wrench and a floor jack. The extra time to file down would have added 5-10 minutes so they could have easily done it in less than an hour. The stock pulley is at least 10x heavier and of course bigger. The belts went on just fine with loosening the alternator and the small pulley. Performances differences are it seems it want to pull harder in the mid and high ranges. Top end feels more eager to pull. When leaving my boyfriend's buddy's house, we were able to do about a 15 foot burnout (which had really never happened before) before he let off of it,,,on 18's All in all, a good mod, and recommended. I didn't get any pix while they were doing it cuz the digi cam batteries died. This install was on a 96' 1st gen 5-speed. Header to get here on Monday, gonna be installed along with 2.25" mandrel bent stainless and high flow cat next week. I'll let ya'll know how that goes.