Even the dead slow 1.8 4 cylinder Z3 that was only produced in 1996 and 1997 had more power than the Miata. Any straight 6 in the Z3 is vastly superior to the Miata. With about 300,000 Z3s produced, you should be able to find plenty. Don't get me wrong, I had a Miata and it was a fun car, but it doesn't compare to…