Depends on the bike I guess.
My Hayabusa still has the stock exhaust. I use that bike for touring, and I do not want to hear that drone on the highway for an 800 mile day.
My TLR has a full titanium Yoshimura race system, and it sounds just right, albeit louder than I prefer for an around town bike. I don't ride it a *lot* these days, but it definitely gets heard when I do.. People 10 feet behind me don't like feeling the exhaust pulses either. LOL
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