I had a Stillen Hi-Flow intake for less than a month. It made my mpg go down from 21 to 16 average. Thought this was weird. Bought the Injen and after installing and driving for 15 minutes my mpg went back up to 21. I have even gotten the highest ever of 23.5 when driving for a couple hours on highway. Great intake, highly recommend. I also have Motordyne Art pipes, XYZ y-pipe and Fujistsubo Legalis R exhaust.....and MD plenum spacer. With everything notice nice gains
