The ZT 180 although having the 190 engine had to be detuned slightly as the 190 tune was too harsh for the automatic gearbox
Yes you can tune the KV6 but you're not talking by much which makes it not really a viable option cost-wise as you're only going to gain a few BHP
Far better to ensure your VIS motors are working correctly and possibly adding a K&N type Air filter and less restrictive exhaust.
Russ