I have a 2004 4.8 silverado and running Magnacharger they are way to go its all self contained as far as oil, and I believe they warranty your engine like the dealership ( don't quote me on it but it use to be that way ) but it's no maintenance to them once you set them up. It's a straight forward installation and they ship a tune to download and your ready.
I got two of them and if need to I would definitely buy again
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