The Fast Intentions Intake tubes are indeed 2.5".
They have run them past 650, and within safe limits. From what I have heard, they can take up to 750hp(theoretically) on their particular kit, no doubt 700 is within sight. I daily drive north of 610 on 12.6psi. On a 2.5" intake tube.
Your mileage may vary, maybe it is based on the kit setup, but they have found the stock maf easily capable of 650 without a reason for concern!
Last edited by faceglide; 08-17-2014 at 05:45 PM.
Reason: clarity
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