[bigjae1976]

I've been doing research and brainstorming for my E46 and what I've learned is differential air pressure is the key to get flow across the radiator. It is possible if you can improve air flow through the radiator that you can run a smaller radiator core.

Most of the solutions I've seen is bigger radiator, more air TO the radiator. Not through.

I think you can solve overheating issues if you can duct the back of the radiator somewhere. Requires tilting the radiator forward which would be very tricky for this platform. A more efficient backside duct can be designed the more the radiator can be pushed forward and tilted.

For my E46, I also plan to use a full face oil cooler on the back of the radiator. This will warm up the oil much faster and be more efficient in terms of cooling and aerodynamics.