I am running an injen cai. Completely changed the sound. You get the turbo whistle. I also installed k&n intercooler pipes and a blow off valve. I also installed an mbrp cat back exhaust . My gas mileage has gone up I was getting 17.6 now I. At 19.2 and still climbing. For reference I am running a heritage edition. My next will be a tuner. Undecided on which one. I am also going to 37s so I am expecting to drop back down to the 17mpg range. Also in a manual. IDK if that info is relevant to you
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