Greetings Robert,
Your Z-Force 1000 is already over 100HP. Allow me to explain.
CF-Moto registers it's power and torque to the ground, Break Horse Power (BHP). The 1000 is 80 HP to the wheels, which if you mathematically calculate drive line loss, that puts the crank HP to about 106-108hp.
As a comparison, Polaris bolsters their HP number by using the crank HP rating, not the wheels, they rate the 1000XP at 110 HP but on a dyno they are registering 81-83hp to the wheels.
The Z-Force also produces more torque then a RZR 1000XP due to it's V-Twin design. The Z-Force can launch away from a Polaris off the line, hold ahead of it but the RZR will take the Z-Force in top speed due to much bigger clutching allowing it to pull past 70. You Z-Force 1000 will clear 70, but it's strong area is 0-60.
Two Brothers does make a nice exhaust that not only sounds wicked (being a V-Twin) does improve some power. There are some other areas that can improve power, (inside the engine). I do not know of anyone doing ECU tuning as of yet.
Hope this helps you out.
Thank you
J