A guy in the Australian forums has dyno'd his JB3 install. I think there was mention of approx 50rwkw gains + 70-80nm torque? Unless I read the graph wrong. I Probably have knowing me! Anyway check it out, it's under "party time" or something.
Edit: Okay I won't be lazy!
http://www.1addicts.com/forums/showt...t=15068&page=4
Half way down the page, I believe the red is stock and the others are the 3 trials.
Peak torque: 474.8nm (85.9nm gain)
Peak power: 250.5rwkw (49.8rwkw gain)