Reviewed By Barry Q (Fishersville, VA) Reviewed for a 2002 GMC Sierra —5/14/2016 6:45 AM
I am always leary of claims of better power with simple add on's. My original MAS was giving an error code. The dealer wanted more for a replacement than AA did for an upgrade. So I got the upgrade. WOW, I actually see a difference. More on the low end (I pull trailers), and smoother running. MPG has not changed, but I got it for power not MPG. I'm happy with purchase.