IMHO this is the most successful 13B cooling arrangement so far flown.
The rad is a custom double pass 533 cubic inches by two inches thick.
The rad fits in a stock RV6 cowling. Note there is no
room under the PSRU for a starter with the rad in this position.

The throttle body and K&N filter is under the intake plenum.
The stock Mazda ignition coils are back and down from the filter.
The remote oil filter is down in there too.

Paul Lamar
 
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