40mpg Posted March 20, 2021 Posted March 20, 2021 I just installed a larger "cat back" free flow exhaust system on my 2007 civic ex which appears to have made a significant improvement in mpg. However I still have the tiny front exhaust pipe between the converter and new free flow exhaust system. I was wondering if anyone here knows if getting a larger front pipe would further increase my mpg? Also if noise would change significantly?
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