Factory replacement. Installed yesterday according to instructions. It works, doesn't report my computer. Throttle response is a bit better, but I think it's more because the old one was a bit glued on the inside. I had already done all the other upgrades, cold air intake, computer tuned, headers, Flowmaster exhaust, on my 05, 5.3. As I said, I didn't really notice much. Update: Jet MARV reworked, didn't like all the negative reviews about not working with CAI. I finally found a MAF made for CAI by Granatelli Motorsports. I installed it and it really woke him up. I LIKE IT! My truck no doubt runs and drives much better now than it did when I bought it. It has 182,000 miles on it and is picking up speed. Also, fitting a Corvette servo into the transmission helped a lot with tighter shifting. Alone, these things don't work very well, but together they're good. I would also recommend letting the exhaust out first before attempting to let in more air.
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