Hi,
There is no difference in engine performance. The "Z" simply means minor luxury add ons were left out in order to reduce weight eg. powered seat.
Hope this helps
timaje@gmail.com
Nope the Z edition has mostly the same mods as the RS200 but has traction control and an LSD added and a few other bits.
The L edition has the electric seats and is slightly heavier (10kg) leather seats being optional.
This link is awesome....
http://www.japanvehicles.com/newcars/toyota/Altezza/main.htm