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I dont think you're really gonna see much change at all until you start doing custom tunes. They did a pretty dang good job on the stock exhaust even with all the DPF crap.
I'm looking at an aFe or MBRP DPF-Back dual exhaust kit.
On my '13 I did the whole DPF delete, exhaust, cold air etc. Power was up a little but fuel mileage didn't change much.
Does anyone have any experience with either of these systems? Other than looking good, any "real world" gains?
I can let you know soon. I ordered the 5" DPF back system from MBRP. I did it strictly for looks and because I got a good deal on the exhaust setup. I'm not looking for, nor expecting a sound or performance difference, just to get rid of those UGLY OEM tips!.
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