Reviewed By Craig R (Mountain View, CA) —4/30/2015 4:12 PM
Not sure about power or mileage increases. I installed the Helix, with an AEM cold air intake, along with pulstar plugs, and didn't really notice much. Once I installed the Bully Dog programmer, things changed. Power increase is very noticeable, and I'm averaging 1.5MPG more, which is over a 10% increase!