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So this is how my Monday starts. Started the car early because the windshields are frozen, turned on the defrost for front and rear. All of a sudden it sounds like my car backfires, and I mean loud. It's a 2014 si sedan?! How is this thing back firing?, nope I walk around the back to find that...

Can anyone comment of how adding a catted downpipe has effected their mpg?

New guy here. I just got a 2014 si sedan last weekend and I am absolutely loving it(except for the non-existent detail job at the dealership). Years ago I had a 2009 civic si coupe and enjoyed every single one of the 100000 miles I put on it. My only regret being that I left it completely stock...