Well, there appears to be a wrinkle in this idea. Apparently there are some overheating issues some people are running up against with these power adder systems. There is a thread over on cf I was reading the other night that was digging into the problem a bit. The impression I was getting reading that thread is that these systems are all more prototypes or beta test units, rather than production "tried and true" systems.
Pewter99 was on that thread as well mentioning overheating problems with his maggie....
I'll have to read up more on this. Not really interested in spending this kind of money in order to buy into a major headache.
The extra power isn't a good tradeoff for having an overheating engine because of it during normal driving.