IngotSilverSnake Posted August 5, 2012 Report Share Posted August 5, 2012 (edited) I am ready to put some axleback mufflers on the 2012 Shelby. I think I will go with Borla S-Type or ATAKs. I added Flowmaster American Thunders to my 2012 5.0 but the drone was terrible. This will be my first mod and the Shelby is completely stock otherwise. My question is, what horsepower gain can I expect from changing mufflers? Here is what Borla says on their web site: Q. How much horsepower can I expect to gain? An engine is an air pump, and BORLA's exhaust system allows the engine to pump and flow more uninterrupted air. The actual horsepower increase depends upon the fuel management system's ability to provide the right amount of fuel to match the extra air flow; 5 to 15% increases are not uncommon. Under racing conditions, our XR-1® collector mufflers actually make more horsepower than an open exhaust! If this is true, I can expect a 27.5 HP to 82.5 HP gain. I have a hard time believing even the low number with no other mods. Has anyone added Borla mufflers with no other mods and done a dyno to check the actual HP gains? Edited August 5, 2012 by IngotSilverSnake Quote Link to comment Share on other sites More sharing options...
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