It'll surely help with performance, not sure about mileage, it has an adjustment knob that you turn up, all the way left is stock, all the way right is 200 h.p. thats what i was told not to sure if info is correct. Someone on this forum should know the specs. I know when the unit is turned up you have to pay attention to your driving so it won't get away from you!...It's a lot of fun!!!
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