Anybody with an after-market air intake kit (k&n, air raid, brute force) see any mpg increases? I'm looking to buy, so I'm looking for some input.

 

I installed a Airaid CAI on my 04 SLT 4.7L after having a Flowmaster 40 installed so it was the 2nd mod and I went from 17 to 20.8 Hwy so I'd say it clearly helped with gas mileage.

 

yup, about 2-3MPG on a 1999 5.2l. also using airaid. however if you have an older 5.2L and are buying new I would go with the K&N because the airaid didnt come with a heat sheild. on the other hand i got mine for $65 on e-bay and have no complaints

 

Yep, I use a Edelbrock and noticed 1-2 mpg improvement not to mention some additional ponies.

 

hummm, all I got was a heavier foot... [sm=gears.gif]

 

any decent intake/exhaust combination will produce a 3-6 mpg gain.

 

yeah you have to be careful though, if you open up the intake or exhaust too much, mileage will go down. the upper end will perform better though...

 

this would only be a temporary problem while the computer takes time to adjust fuel ratios. after about 200 miles you would be running at an optimal ratio which would use your new intake/exhaust to its fullest.

 

depends on the change... I had 3 or 4 different setups on my 2000 5.9 motor and some lost, some gained. one example is when I had the dual out flowmaster setup... dual 2.5" out's lost me 1.0~1.25 mpg along with low end torque. closed it down to dual 2.25" and got 1.0 mpg back along with some low end torque. still flowed pretty good for the upper end. I also took the stock cone filter off my K&N intake kit and put a bigger filter on it (6" dia x 9" long) and also lost some low end & mpg. it sure did scream up top though. each change I tracked mileage over a longer period of time... some as short as 1000 miles, others over several thousand.

it only takes 200~300 miles for it to make it's adjustments...

 

the loss usually comes due to a universal kit. if you are running a product, whether it be exhaust, intake, cam, tb, ect, and it is not designed specifically for your vehicle, you are definately risking a drop in hp, mpg and torque. in my original post on this topic i stated and "decent" intake/exhaust combo. i was being too general. what i meant to say is if you do a little research, you will be able to find dyno results from any repuitable manufacturer with different combinations of their products. doing this will ensure you will find the setup that will produce the best end results for your application.