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I recently put a UFO 4-2 exhaust on my vmax, and it seems to run different at highway speeds (around 4.5k rpm). Hard to tell if its misfiring or backfiring. It just doesn't sound smooth. So I went to adjust the mixture on the carbs and all of the mixture screws were between 6 and 8 turns...

I put the UFO 4-2 system with the megaphone "mufflers" on my vmax this winter. Took it out for the first time today and boy is it LOUD. I was wondering if there were any other mufflers that would be a direct fit onto the UFO system? Or is there any way to modify the megaphones to make them a...