I use one on my Chevy powered Buick. I just installed it, so I don't know how much of a gain I'll see, but it feels strong on the highway. We recently removed an NOS Super Power Shot plate from a friend's car and installed a ZEX plate. He picked up around 4 tenths over the Super Power Shot!
Thanx guys, I have used the speedtech difuser plate before and liked it but I have been told to try the Zex perimeter plate, I'll need more opinions before I buy the setup because once I buy it Im kinda stuck with it. This will be going on a small block ford so the only concern is starving the front and rear cylinders,the difuser seemed to solve that problem so Im curious if the Zex plate will also.