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Personally, I think the aftermarket exhaust on an otherwise stock Hawk would probably give similar results to a modified exhaust. Maybe its a little better, but having seen the ebay exhaust for myself, aside from the straight through muffler on the end, I honestly don't think there would be much difference between that header pipe and a decatted stock one. If there is, it would be fractions of a horsepower.
As far as stock carb vs. the VM26 Mikuni. Personally, given the similar specs and layout of the two carbs, I don't think there is any performance gain between the two. The main advantage of the VM26 is that it is far easier to setup thanks to the availability of jets. That said, A comparison between the traditional VM26 and a 30mm flat slide PWK/KOSO or Mikuni would be interesting. I just don't happen to have one of those on hand.
As far as the baseline. My only problem with out of the box with zero carb tuning is that it's essentially not as it should be. That is why I like Pete's idea for an otherwise stock bike with the carb jetted properly. I think that is a fair baseline to start with. It won't take much for me to toss a 105 main into the stock carb.
Just keep in mind guys, while I would love to spend the time to do every little bit, this isn't a free endeavor for me. $55 each set of runs out of my own pocket here. While doing 2 or 3 runs is reasonable, 10 of them will cost half the price of the bike. That is why I think a properly jetted stock bike vs. a completely modified bike comparison would be a great comparison. With maybe an exhaust only run tossed in, and only because I believe the stock exhaust is the most restrictive part of the bike.
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