I just had an AU XR8 65mm T/B put on my 5ltr EB XR8 the other day. Mate does it have some pull now! Much better than stock!
With the pacemakers and the T/B working hand in hand, it makes a considerable difference in mid-range to top-end torque and horsepower.
Yet, there was some mucking around to make the T/B fit, it still was worth the effort. (my mechanic put it in by the way)
I admit its an expensive exercise for an approximate 5kw gain but with the extractors taking care of the other end, it worked out to be one of the best moves I've made to make the car go faster so far.
I plan to get an EL or AU XR8 upper and lower intake manifold to suit and a set of Yellaterra roller rockers, which will hopefully boost flywheel kw's to 190 roughly. I'll see how the money tree is before I do anything more within the next few weeks.