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I was catless for a few years with MY05 and the only real benefit is a different sound; there's less of the noticeable boxer-rumble (probably not a concern on the FA) and it definitely cracks/pops and sounds more like a racecar. The downside was a very noticeable exhaust smell all the time which makes sense. I'm back to a single cat now because I got tired of putting it back on for smog (for CA) and outgrew the smell.
 
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