where did you get to drive at 140mph.....
I think I would like to come and visit...
I think it may be time for a tune, but seeing you are already going down the path of doing a lot yourself, why don't you get a wideband hooked up and get one of the less expensive alternatives for tuning, and DIY. I know all the rage on here is to go to a dyno, but you definitely seem like someone who would have a good time tuning. Lots of help in various places to tune correctly etc.
I have had a chance to go and get some more airflow info after getting the exhaust in.
Interesting how the airflow has smoothed out significantly all through the rev range now, and significantly improved in the lower revs. Will have to take some time to log some lower revs, just haven't been bothered as they have been so erratic, seem so much smoother now. Interesting.
Bit more airflow as well than before. I have obviously reached the peak of this manifold. But interestingly at peak torque I am up around 95% Volumetric efficiency, and I am above 90% v/e between low revs and 6150rpm. Sounds like everything is running quite well in there. It would be so good to compare some info from yours. I realise that temperatures are so different, and I know a 10C difference for may makes a huge difference. So I am at 28C when I have been doing the tests. I am sure it would not be to hard to factor in your details and compare apples with apples. should be able to adjust for the difference of temperature, afterall it is only a calculation.