I used to mod but only clutching. My XCR will stay stock.....this year :) I have yet to run head to head with another comparable XCR 800. The machine is not a big number runner, it's geared for trail fun. Last weekend on my runway, groomed, loose snow 0 C. The best I got on radar was 92mph indicated 97mph. The other sleds I was with run GSX 600 ETEC 86mph, 2011 Rush 800 89mph, 2015 AXYS 800 91mph. The AXYS wasn't pulling good RPM that day.