REAR SWAYBAR
This is a popular modification to do to the Berettas. I could waist a lot of time telling you all about it but instead I'll just send you somewhere thats already done that for me.
http://www.beretta.net/performance_corner/custom/susbrake/z51.html
You can install that sway bar on the 94 Z26 with barely any problems. In 95 and 96 the rear suspension changed, sorry guys. The 94 Z26 does have a rear sway bar from the factory. It is a straight and hollow bar though, not very effective. I left mine on when I put the Z51 bar on.