[Southside1983]

Best mod for me for MPG has been a magnaflow muffler swap. MAYBE 1-2mpg on the highway. I also have a Bullydog GT and a AEM bruteforce intake and they did little to help mpg.

 

[Southside1983]

Thanks for the info. Which MAGNAFLOW series? dual or single?

Magnaflow 12258 DI SO