David,
The rad looks to be a similar size to mine (26 * 16 * 3), but I never liked his elephant trunk P51 thing. If I remember right, his cooling was sufficient but, just like Greg Richter's multi-scoop setup, I think he was creating a lot of drag. My rad is symmetrical to the airframe angled as much as possible to the incoming air and my plenum is uses the bottom of the lower cowl as its base. I don't know how well the air will turn a right angle and go through the oil cooler, but its hard to find anywhere else to put the long thin one.  I felt that the coolers (2 oil and 1 rad) should all be directly on the plenum, thus all getting the same pressure. I would have put the intercooler on the plenum too, but didn't have room so I had to add a 3 inch duct to it. As a result I think my intake temp (and EGT) is a bit high. I also have a filtered (with bypass) duct to the turbo air intake.

Yes, I thought I had two oil coolers. The differences are minimal.

>or exhaust flow to aid in air flow through the engine cowling / engine compartment and across all heat exchangers.
yes. I put a stock turbo shield over the T04, then extended it with a stainless steel shroud extending just beyond an  8 inch cowl exit. The 3 inch exhaust stops a few inches short of the exit so air is sucked through the rads and past the turbo. At least thats the theory.

If you add a fan, try to make it pull air from outside rather than from in cowl. ie it needs to pressurize all possible airflow areas except the one you want to draw from (the naca). My oil coolers weren't pressurized by the fan, so I'm guessing it pulled its air through them.

>Wow, the standard NACA scoop is working that well for you.
Yes. I was careful to make a nice airfoil shaped wing for the bottom of the opening to create low pressure in the entrance. The plenum must be tightly sealed. Also, I have two vortilons on the belly behind the landing brake.

>Not sure why they wouldn't have a proven turbo with the ceramic bearing.
Yes, you'd think so. I just took the recommendation of a guy who obviously knew a lot about flying turbos. I hope they use a better ceramic coating than the one they put on the outside of the turbo - that lasted about 6 hours.
Regards,
John