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Okay, I've seached around and looked for a full cat back exhaust with a 2.5 inch muffler and can not find one for my 2004 ex civic (sedan). So my question is does anyone make one thats "worth getting" or could I put like a acura rsx or a tsx system on and will it fit or no?

 
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2.5 muffler or piping? most catback mufflers are like 4 inches...to me...piping is piping...just get one off ebay...if you're really worried about sound...then youtube different ones to see what you like...