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I have a 08' Chevy Silverado 1500 5.3L. I put a K&N CAI, Granatelli MAFS, Airaid TBS, and 50 series single in/dual out Flow Master Muffler on it. I bought the Cortex Programmer. I was wondering if anyone knew about how many horsepower I gained from these modifications

Sorry to rain on your parts list.

But the aftermarket MAF meters, do not play well with off the shelf tuning. They would require custom tuning, which we can not offer.



If you can get me the trucks 8th digit in your VIN, I can tell you exactly what that motor makes. Their are 4 different 5.3L motors of 2008.

Ron

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