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Discussion Starter #1
Has anyone removed the ugly exaushst collector box on a S4R? Any performance gain?
 

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that's the catalytic converter (european mandate). you
can get several brands (arrow, sil, etc.) to replace the
whole deal, cans included, and there is also at least
one company which sells replacement mid pipes to take
the converter out .... watch out for these, though, as they
don't have the cross-over (could result in changes to the
torque / power curves). simply changing exhaust may
not get you much, but if you open up the intake and change
the injection map, i hear there are significant gains to be had.
 
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Discussion Starter #3
that's the catalytic converter
actually, it's not just a cat. it's primarily a resonance chamber for the exhaust to help make up for the teenie amount of volume the cans offer.
 

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no cat in the US models
 
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