Since I bought my wife her Suburban, the AFM system was driving us crazy! It would kick in and out and cause a terrible exhaust drone that bothered everyone. Since purchasing the Range AFM Disable Device, we actually enjoy taking the Suburban out and getting constant and consistent V8 power. Gas mileage has stayed about the same @ 18.5 mpg but without the lag of the AFM kicking in and getting "tripped up" on itself and not shifting correctly. I highly recommend this product!
2001 pontiac firebird 3.8l v6
This review is for the the jetperformance stage 2 module. I did notice A difference in power over the stage 1 wich is what I had in my car first. Not A whole lot maybe like 5 horsepower or so but it is noticeable. It makes your idle A little higher and A little more rough. I will be installing my stage 1 back in my car. It idles so much smoother. Also I was running the stage 1 with intake and cat back exhaust and it was fine. Just A little less power.