correct answers here, lighter/thinner/less dense = louder usually, more raspy etc etc..

Its physics..

I have exhaust system that is quite loud, perrin headers, x-farce dump (mild steel I think?) then Trust Titanium from the dump back and titanium cannon. Its light (centre and exhaust combined weighs less than 6kgs). Trade off is that it does drone at certain speeds, but I wanted lightness, note and performance which is what I got.

Wasnt cheap. : )

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K.E.R.S!!!1