Adrian was close. Same power as before 105 kw but at 6400 rather than 6800, so power around 6000 was obviously higher, a bit less around 5400 but a fair bit more down around 4000 and a little bit more below that. The air filter arrangement we cobbled up was hopeless so the runs were done without it, ITBs had a good Pipercross set up. Really good further improvement with 5 degrees advance on the inlet cam, no less power at 6400 but slightly quicker drop off from there and more power almost everywhere else with some really good increases. The car feels a lot more responsive at medium revs on light throttle, first gear take off particularly good. A bit flat at the top end but I put the filter back on before driving it so some of this would disappear with a better intake arrangement. I reckon this manifold on a standard road 405 Mi16 would make climbing hills much easier because of the part throttle torque, maybe the plastic box working. Final advantage is that the brakes feel better due to the greater vacuum available. So worthwhile for this car on gravel I'll keep the other project motor and try it in something else, Autocross or rallycross car perhaps. Maybe able to fit a better inlet manifold into a 405 body, lightweighted of course.
4.8 FD gearbox ready to fit and hopefully that will be the development phase finished.
I'll put the graphs up when I have some time, just got home.
Checkered Tuning in Keysborough did the tune, they are really good, did it all in about 3 hours, starting from nothing in the way of maps. Trent really knows his stuff.