Originally Posted by Rusty

A couple of tuners have notice a small increase in HP on 2015+ Z with full bolt-ons over older Z's with the same bolt-ons. The one post I read said that there is a difference in the 2015+ ECU's. If I remember right. They have more RAM. There is basically 3 different ECU's for the years. '09, '10 to '14, '15+. Each up-grade has more stuff in it.