I have one with a os46fx and a macs muffler. this thing rocks. tons of power and smooth. I think i got the harrier program set. I was doing harriers a foot off the ground yesterday. hehehe. still havnt got the balls to roll it though. wieghs 4 lbs on the money. If you want to see it click on the www on the bottom to go to my site. Pics setup info and details. have fun