Hi Expert out there ~!~!

I like the free flow of straight through system exhaust . . but i don't wanna go against the law and polute the enviroment I was wondering . . a cat back exhaust system . . will it allow better flowing of exhaust gas compare to the one where the cat is right after the header ? ? ?

Ignorance question Cat Back exhaust issit something thats on the EF series civic ? ? ? and if it provide better flow then issit possible to install a cat back exhaust system on a EG series civic ?

And . . can someone tell me roughly how much bhp lost using a 'approved' exhaust (with cat back and OEM sound cancellation muffler) compare to a straight through exhaust ? ?

Lastly . . issit possible to get a free smooth flowing 'quiet' exhaust system ? ? ? if yes . . recommendation please

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