Reviewed By RICHARD J (Parachute, CO) Reviewed for a 2005 GMC Savana —7/13/2014 9:25 PM
Big difference in power. I get 3 to 4 mpg more when using performance level.
Reviewed By Kendall M (SALINAS, CA) —12/12/2014 12:27 AM
I used the premium fuel setting, 100% shift firmness, recalibrated my Speedo, up'ed the rev limiter and shift points and the speed limiter and it only took five 5mins and I can definitely feel the difference. IT was as big of a difference as my cold air intake worth It! I can also feel more power even when it's not wide open!