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JTEVO2Accord is right. losing back pressure is what we should always worry about.

perhaps, our so-called dual exhaust setup is nothing but fake with y-pipe rear sending out 2 exhaust pipe to make it look "dual and cool".
but yes, it does send out more air than single exhaust. We had debate over this in V6 forum about how single exhaust system gives you more stable low-end than dual, meaning slightly better acceleration but dual helps out in top-end. (all this crap is V6 knownledge, doesn't apply for inline 4 though).

What i really like about dual in my accord is that sound is deeper tone that single exhausts. ;)
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