Garfield helped me out with info on the Supertrap system for my Rally car. We are running a Digi Tech
mod on the ECU with a smaller pully on the Supercharger (12psi max boost).
On the Dyno we had best power with 18 discs but more torque with 12. We went for the torque for the rally. The power increas was a couple of HP but the torque was about 10 ft/lbs.
We ran the exhaust out through the original centre hole (we dont need a trailer hitch) and it all worked well and sounded sporty. (too sporty for road use!)
You can see the set up in my gallery photos