The Magnuson-Moss Warranty Act prevents dealers from voiding your warranty just for using a third-party cold air intake. They would have to prove it caused damage to the vehicle.
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The method that Cobb uses to flash the ecu leaves no evidence that the ecu was ever flashed. It does not add a flash count and can be returned to 100% stock.A tune can be worth the investment, especially when paired with the benefits of running an intake. However, tuning is only an option for people who are willing to risk voiding their warranty, since a tune leaves a footprint on the ECU even after being flashed back to stock.
In comparison, adding just an intake will not void the warranty and can easily be removed if needed without leaving any footprint behind.
I may get blasted on this, but here goes... Cam's test did not show an appreciable difference in power between the aftermarket CAI's and the stock intake. By appreciable, I mean can I feel or notice it in acceleration or responsiveness. I'm gonna leave sound out of it, because that is separate thing to me. I'm thinking about noticeable gains in power. Unless I am shown unbiased data from an expert (i.e. Cam), I'm under the impression that it may be cool to have all these intakes and such but my user experience with the truck is not going to change in terms of noticed power. Even the downpipe Cam did wasn't a big gain, it just smoothed out the power band. I have a Stillen exhaust, and they claim something north of 20 HP gain. All I can say is it's louder, but I didn't notice anything else. I was dreaming of doing all the intake stuff with my truck until I realized I probably won't even notice the difference other than in my checkbook