What's it Worth? 2014 California Special with Roush Phase 2 Kit

Tough question There are two Bosses advertised here in Maryland a 2012 for and a 2013 at $30k. 2013-14 GTs are around 20k. I know apples and orange's because of the super charger and your location but $20-30K may give you a starting point. What does it cost to add a stage 2 roush supercharger to a GT up your way? I would recommend really doing your homework on a supercharged car with 61K miles it could be cream puff or had the stuffing raced out of it. How did the PO take care of it? You said it was a DD so it just did not sit pretty in someone's garage waiting to to go fast. Because of that I always have trouble valuing modified cars.