I have a 3.4 whipple crusher setup with 2500 miles on it. Spins smoothly and quietly. Comes with whipple tensioner pulley and 3 different pulley sizes with belts. 3.50 pulley, 3.75 pulley, and 4.00 pulley that's is on whipple right now. If interested in can send a video of me spinning pulley so you can see and hear whipple. I would like to trade for a single or twin turbo setup. I know it's probably not going to happen but I figure might as well try. Any questions just ask...