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 joseph f (SUMTER, SC) Reviewed for a 2012 Chevy Silverado —2/26/2015 9:12 AM
plug and play...this tuner literally unleahed the beast in my Silverado. I deleted the AFM system, set shift firmness to 50%, and tires set to 35"!! She RIPS down the road now. No irregular shift going downhill!!! THE MOST IMPORTANT is my MPG went from a dead on 11.5MPG to 15MPG. ALL is perfect now!!! BUY ONE< YOU WONT REGRET IT!!!!!!!!!