Reviewed By Davidwardsd E (Nampa, ID) Reviewed for a 2000 Pontiac Grand Am —5/11/2011 7:12 AM
This help the inside in throttle response the stock fuel maps to the best mix
Reviewed By Will B (HUBBARD, OR) Reviewed for a 2011 Jeep Grand Cherokee —2/7/2016 5:57 PM
Read that works best if used with premium fuel, have ran premium in it the whole time I've owned my jeep. It does actually work as advertised. More power across entire RPM range, has increased my mpg by only 2 though nut still an improvement.