If it's just a can you're after then they all fit the same* so the least modification bit don't matter.
Best for what? Being loud/being cheap/being carbon/being an unpronouncable name? No such thing as 'best', within certain very very tight parameters they're all the same anyway, take a makers claim that his wonder pipe will make 5bhp more than any competitors will with an enormous pinch of salt.
*Hacksaw time! Or a grinder if you're posh.
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If an SV650 has a flat tyre in the forest and no-one is there to blow it up, how long will it be 'til someone posts that the reg/rec is duff and the world will end unless a CBR unit is fitted? A little bit of knowledge = a dangerous thing.
"a deathless anthem of nuclear-strength romantic angst"
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