Went to put my pipe back on the bike ('03 450) and cracked open the manual to look up the torque spec. My header has a stud/nut on one side of the exhaust flange and a socket head cap screw (Yamaha calls it a bolt) on the other. Not sure how to interpret what the manual says: "First, temporarily tighten the nut (exhaust pipe), then tighten the bolt (exhaust pipe) 20 Nm (14 ft-lb). After that, retighten the nut (exhaust pipe) 13 Nm (9.4 ft-lb) and then the bolt (exhaust pipe) 24 Nm (17 ft-lb)." I may be no factory trained master mechanic, but a few things here do not appeal to my sense of order. Couple of questions: 1) Is the purpose of the "temporary" tightening to compress and seat a new exhaust gasket? If so, I would be inclined to tighten both the nut and bolt to 14 ft-lb in stages, as opposed to completely tightening the nut first followed by the bolt. 2) When retightening the nut and bolt, why would you want to tighten one to 9.4 ft-lb and the other to 17 ft-lb? Wouldn't you want the same torque value for each? Can anyone out there can explain Yamaha's logic? Thanks in advance for any help!