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Bigger front exhaust pipe and mpg


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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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