Got 2003 GMC sierra with 5.3 I want to run two and half in pipes out each side by using two mufflers not the one muffler set up over Ben told If I do it this way I loose. Gas miles and it would run ba

Asked by Feb 15, 2015 at 10:24 PM about the 1999 GMC Sierra

Question type: General

1 Answer

780

NEVER HAVE I HEARD THAT BEFORE GAS IS ALREADY USED UP WHEN IT COMES OUT OF THE MUFFLERS SO DONT REALLY SEE HOW UR GOING TO LOOSE GAS MILEAGE

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