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Exactly what I mean. No tune, best to leave the intake alone. I have a K & N filter for my Bullitt. It came with it when I bought the car used. But no tune. It doesn't matter what filter is in the box, I get the same gas mileage for the same reasons I stated above. You can increase the intake capability all you want, but if the engine and it's controller are not set up to take advantage of the improve availability of intake air it's a wasted investment.Scooter Scott said:Well I have an XCal with a tune on it...is that what you mean?