[cinFLA]

BTW, my stock-mufflered 1000cc V-Twin powered bike makes about 90 HP and will do the quarter mile in about 11.5 seconds, which makes it more powerful and quicker than about 90% of the loud-piped Harleys on the road, all without pissing off all and sundry. And given a place to do it it would run all day at or near its HP peak.

I don't think Harley owners think of performance when they open up their pipes. I think it is about ticking others off.

[-YYZ-]

Some of them don't. The guys that slap on drag pipes and don't bother rejetting are obviously just looking for noise, as they've probably lost power at most rpms.

[Melas]

I don't think Harley owners think of performance when they open up their pipes. I think it is about ticking others off.

Nope, we call it paying the tax. Harley's are crippled off the showroom floor, and I mean crippled. Often times you can get a 20%-25% boost in horsepower by paying the tax, ie, high-flow airbox, high-flow pipes, and rejetting the carburator to accomodate both.