Fitted mine about 3 months back, no problems with change over, subtle but noticeable increase in mid-range torque, you are suddenly going quicker than you expected to be, I have now actually wound back the WGM and seems to drive more smoothly, but that might well be because of the HD torque converter also, no need for revs now. I have been getting an extra 50kms on a tank also and that is suburban driving. So well,worth the spend and effort IMHO.
