Aftermarket Mufflers. Longer Midpipe's?

Anytime you modify or change your exhaust to a design with different dimensions you are pretty well assured that your "optimum" jetting has changed. Usually an owner puts on the new system or part to it and if it runs as good or better than before (or feels like due to increased noise or "hit" is more pronounced) the owner is happy and doesn't dig any deeper.
 
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