It is interesting this subject came up at this time. As some of you know LPE is sending Graham here next week to tweek things abit on my rig. I am always trying to eek out more HP, so in anticipation of his visit I asked the following:
1: Should I get a Granitelli Motor Sports (or any other) highflow MAF, and
2: Would it be wise to install a ported and polished Throttle Body?
The reply was a simple "No, those items have not proven any HP gains, whatsoever." They were particularly negative on the MAF stating they do nothing, period.
Tim went on to explain that 1/4mi times decreased by appx. 2 tenths with an electric fan kit! Of all things...
So, while you will in no way have a seat of the pants increase in performance, it will be there. The tests were all done on heavily modified 6L trucks including the H2.
As a bonus you can also cool the radiator and engine by running a switch to the fan and running it while the vehicle is parked and the engine is off. Do I have to mention not to run it for long periods of time?!
So, PhilD is correct as usual...
Black Lingenfelter Lux