I lol'd at taking a 4AC on the dyno, however 42kw is not to be sneezed at. Comparable to what a few 4AG's made at Autosalon a few years back......
The rear brace looks sick man, you should certainly feel the improvements in the a car with so little lateral bracing compared to the sedan.
Also, although i'm sure you have your mind made up, i'm going to +1 the 4AGE. Excellent usable amount of power for the chassis.