WOW !! that is an awesome price. I've been pricing out a 2.9L twin screw Whipple SC for the wife's 2012 FORD F-150 with a 6.2L and they are at $7500.00 before shipping. So to me your getting a great deal. I can get it ordered through FORD and installed by Ford add the Whipple warrenty (and maybe keep my Ford Warrenty) for around $ 10,000. It's kind of steep but worth it for the warrenty to me. I've seen Dyno's anywhere from 460 RWHP to 500+ with this set up. In the end it's the wifes truck so odds for sure it won't happen but it would be cool to drive a boosted truck year round.
Did you ask Matt for a price? He might cut you a better deal.