I believed the OEM MAF sensor was damaged so I replaced it with the Jet Power-Flow unit. By doing so I hoped to cure rough idling and stalling issues with my LS2 powered GTO. I was also looking forward to realizing the advertised performance improvements. The Jet MAF sensor seems to help the stalling at idle issue but I haven't noticed any improvement in gas mileage or off-the-line acceleration. For the same result I could have bought a new factory MAF sensor for about $100 less.