Difficult to judge until several thousand miles, if not more, have been covered. I liked that the 8 ounces were just the right size, maybe with an extra ounce for my bike. I have a 2006 Yamaha V Star Classic and the 8 ounces was just a tad larger than the owner's manual said. I haven't noticed any difference in my wave sound or performance so it seems to be working fine. Nice.
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