I ran the full SLP set up on 2 sleds this year. I really liked it. Sound at idle to past half throttle was real quiet, almost like stock which is what I like. From 3/4 to full throttle was where it seemed to really wake up. More 2 stokey dirt bike sound. It sure felt like it made more power and we had a stone stock 12 ETEC to run it against for most of the year. With the weight drop, better sound and what seemed like more power I thought it was $700 well spent. We did have to run 1 gram less weight than what Winterbrew had established as the weight to run with his clutch set up. Both our 2 sleds and one other that he did clutch kits on. I don't know clutching very well and that would appear to be less power but it sure didn't feel or perform like it. Maybe Winterbrew will chime in about this.