Bomber Man - I have an AX53B70 on my 25.
Very very pleased with it, great street/track turbo in my opinion.
Response is a bit duller than stock, and thats about it.
In terms of top end, it's making 250kW @ 21psi, pulls hard all the way to redline (boost drops off a touch but still pulls like a freight train)
Very impressed so far, looking forward to seeing a pair of the AX turbos on your beast
And my God do I love your build... please give more pics... PLEASE!!