I put an Am . Muscle axle back on my 2012 gt and my mileage dropped 5 mpg

Asked by Jun 25, 2013 at 10:22 PM about the 2012 Ford Mustang GT Convertible

Question type: Car Customization

5 Answers

26,245

That's a significant drop. It should have increased your performance and mileage (a little) if anything. Of course, this exhaust system has more to do with sound than it does performance.

145

Keep ur foot out of it

145

If the mufflers are more of a straight pipe like the SLP then that could be the cause for the drop

5

Is it creating drag

If you didn't adjust the Auto or Manual (Transmission / Flywheel) with an Automatic Tuner (plug-in computer pad) then your vehicles WILL significantly suffer. It's not allowing the new parts to be utilized , instead it's using Original Manufacturer's Specifications.

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