I ride a MuZ Skorpion which has a Yamaha XTZ 660 motor in it. I recently installed a more free flowing M4 can on it. My fuel mileage got significantly better- perhaps as much as 20% better. Also the performance of the motor was better thru out the range. These results were without any changes to the stock carbs. If I had bought and installed the M4 can 46,000 miles ago, when I bought the bike, the savings in fuel costs would have paid for it by now. These are the results I saw, yours may be different. One drawback is the bike is very loud now.
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