I can only speak about the quaife install, but with it you need to use the z-tech speedometer drive gear. That is the only thing different about Z-tec and V-6 applications. The later cars may not have a speedometer cable but they still have a gear in the transmission.

99 T-Red SVT #1634/2760
K&N filter
Aussie Intake Pipe
Pro-M 75mm & Optimizer
B&M Edge Shifter
Quaife LSD
Borla Cat back
MSDS Headers/sho-shop Y-Pipe
Dynoed at 184.2 HP & 157.2 TQ
14.53@94.15