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Originally Posted by joel1316
Thanks for the info!
I just got to reading that some of these mods only helped in the higher RPM's and actually didn't do much except increase fuel comsumption at lower RPM's...
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I've had my volant intake on for about 2 months now on my 04 Denali. I do almost all city driving and the fuel consumption hasn't changed driving in the city. I do feel there is more power at the low to mid range. I have 22's on and take off is a little quicker. The engine noise is pretty much the same except when you hit the 2000 to 3000 rpm range then you really hear the volant sucking more air into the engine.
This past weekend I took a trip to Yosemite and I did notice an increase in gas mileage. I drove a little over 225 miles on a little over half a tank of gas averaging about 75 mph on the freeway. That's the best I've ever gotten on my Denali. I think the increased air flow benefits MPG at freeway speeds and not higher rpms. At 75 mph my Denali tachs about 2000 rpms.
I just purchased the Corsa touring system and will hopefully have that installed this weekend. With better intake and exhaust you should definately improve your MPG at freeway speeds. You just can't put your foot into it driving around town just to hear the intake or exhaust.