"Adding a supercharger to your car is one of the most effective ways to add power. However, adding a supercharger typically meant you were locked into that set up with out much room to grow.
"ROUSH® Performance introduces a new Phased R2300 ROUSHcharger® lineup that allows a growth of horsepower and torque through the life of the unit. Owners can start at a base “Phase 1” level and grow to “Phase 2” and finally “Phase 3” as time, budget, and desire allows. This phased approach allows you to start at the base level and upgrade as you see fit."
Read the full story: ROUSH Lets You Build Power with Phased Supercharger Systems (Motorator)