Reviewed By Charles N (El Dorado Hills, CA) Reviewed for a 2005 Pontiac GTO —10/2/2015 8:48 AM
I found the installation very easy. It doesn't hurt to read the directions first. I installed only the standard Performance upgrade first and it did create a noticeably better acceleration. My GTO is an automatic (4-speed) and it definitely shifts smoother under full throttle. It also shifts smoother under normal driving conditions. I'm hesitant to bump up the shifting pressure in the more detailed performance upgrade system; it's still a 10-year-old transmission, albeit a strong one.