Sweet. The first ride with the new pipe last week I couldn't feel the extra power because the rear tire would light up if I even looked at the throttle (extra loose conditions). Judging by the way this thing acts on asphalt I'm gonna be in a world of hurt when conditions are good and traction is abundant I'm with you... I'm keeping my old exhaust around for when things get "impassible when wet" . but I could feel the power increase. because I was getting small unexpected roll on wheelies in what I thought was too loose for traction, just dig a bit deeper to find the hard pack. and it sounded like more pow pow:devil: but I'm really pleased that the whole thing worked out. its not like the exhuast manufactures provied any answers in regards to fitting up a yz head pipe.