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Has anyone spent the money on a GMS airflow sensor, or any other brand? Are they worth the cash? GMS is claiming 10-23 hp, 47% better airflow, but the cost is $350 to $400.
 

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i have one on my 2000 obs 2500hd. it works good. throw on a CAI, and get your computer tuned for the new air intake values, and it will impress you. with just the maf sensor, it increased mileage 1.3 mpg
 
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