When i had it mapped @ GMC there rollers quoted 141 @ the wheels, however i'd say thats generous, when I organised a big RR day at Northampton motorsport it was running a few extra bhp @ the wheels compared to the other cammed cars (without TBs), however TB's will mainly make the mid range much better, and in general make it much better to drive on the road & track.
I'll be running the same engine set up next year, nothing will be changing, im really happy with the engine as it currently stands mate