When piping your SuperHawk, the best bet is to leave the header stock. After speaking to virtually all the major pipe manufacturers, I was told that unless you were doing some major engine modifications, you can't improve on it. Save a little money and just get some cans. In addition, you might want to stay away from Carbon/Kevlar Blend cans. As twins tend to produce more heat than an inline four, the expansion and contraction of the non-metallic wrapping is magnified. Furthermore, carbon fiber and kevlar react opposite under heated conditions, with one contracting and one expanding. I have personally seen bad results (cracking, warping, peeling) on cans made of this combo.
Sound-wise, I have heard the bike with Yoshi's, Two Bros., D & D, Jardine, Moriwaki and MiG's. I took the MiG high-mounts because IMHO they looked the best, but the Two Bros. sounded the best. I live at 4300' elevation and I didn't have to rejet.
According to the local dealer, who also sponsors a VTR racer, you can often get away without the rejet. I've ridden at sea level and all I had to do was adjust the idle down a bit. I guess the giant carbs are a little more forgiving. At the most, you will have to shim your needle a tiny bit. I suggest riding it first and then see if you need to rejet. Good Luck.
Keep the rubber side down!...STC
[This message has been edited by VTRPilot (edited June 25, 2000).]