Years ago BIKE magazine dyno tested some after market exhausts. The best gave only a modest power increase, from memory 1 to 3HP, and nobody can even feel that. Some actually gave less power than the standard exhaust. Most did reduce weight though.
A full system with the appropriate chip or similar, and a free flow air filter, might give slightly more HP and save considerable weight, but you'll be out thousands of dollars.
More than a 250 is worth.
There is a grey blur, and a green blur. I try to stay on the grey one. - Joey Dunlop
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