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I had them - here's my suggestion. Find someone that has the TH's on their bike and ride behind them for at least 5 miles to get a feel for the sound. The performance and flow is terrific and they do thump.
That being said, I took mine off because they were too loud. I'm having trouble with my ears and was tired of the pounding. My new Supertrapp pipes are easier on the ears and now I can hear my stereo. I didn't lose any Hp but did lose 5 Fp of torque. We could have gotten some of that back but I chose quiet over torque.
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