Well I have finally got the ZR back from PTP after they have carried out the R140 conversion. WOW!! What a difference. It is so much more responsive and even treating it gently for the first 1000 miles, the hint of the extra power and torque is there. I have posted a few pictures of the engine bay now after the conversion as it looks so much better than before. Anyone considering this conversion, well I cant recommend it enough.