Exactly this ^
I did see an mpg drop (maybe 1-2) with my tuner, S&B CAI, and MBRP cat back. A small drop like that would never pay for the money you have into the mods though. They're more for smiles per gallon!
You'll want a Diablo tuner with a Hemifever tune though. Hit up Matt at Moes Performance and he'll hook you up with one!
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