Update - just got it back on the the road. The Clutch Masters twin plate clutch took some getting used to but is a vast improvement.
Several sensor, fueling and other tuning issues found and sorted so now its at 515 WHP at just 18lb of boost and its making >>400 lbft between 3200 and 6,800 RPM.
So all this stuff in my sig below, is working in harmony
The AEM V2 was the total game changer for this setup.
The red-line is set at 8,000 RPM so 0-60 comes up with all 4 wheels chirping loudly at launch and a single up-shift. Subjectively, it feels substantially quicker than my old EVO IX which ran 0-60 in about 3.7 sec. We'll find out at the track later.
Probably more importantly, I just drove it home in SF Bay Area rush our traffic - so an hour of 20MPH stop and go in 85F weather - and it was completely drama free. It starts, stops, idles and crawls - and when the road opens up it vanishes.
Driving it with everything sorted is a total revelation! It makes my old EVO IX and current AMG (both of which were/are tuned) feel slow. The new custom Ohlins suspension is a vast improvement. Turn in is crisp and on-power under-steer has been just about eliminated with the new differentials.
Throttle modulation is sweet so placement and rotation mid-corner can be done with steering and/or gas.
Its a lot like riding my Yamaha R1M - you need to have braking points and turn-in already plugged into your brain before you hit the loud pedal - because when you do, you are there already.