Reviewed By Blankenship, J (Elkview, WV) Reviewed for a 2017 Jeep Wrangler —4/27/2017 8:48 PM
I was skeptical at first but now I believe they work and work well. increase my mpg by a little over 1 mpg
Reviewed By Marcos E (CHICAGO, IL) Reviewed for a 2015 Jeep Grand Cherokee —4/15/2016 7:50 AM
This was easy to instal and you can see a difference if you drive a car that reads your miles per gallon, it did boost me up about 3 miles to the gallon. I didn't feel much of a power change but i do hear the whistle like a turbine once in a while depending how your gears change. I definitely would had not paid more than $30 for the other ones since you cant tell the difference dramatically but worth $30 for sure to instal as easy as it was.