I'd suggest if you do to at least use the larger radiator with the old style cap and no expansion tank of the 300D na.
The reason the expansion tank is there though is to provide for the additional heat and its accompanying expansioni generated on a hot day when the turbo is kicking in big time on a long hill. I like the looks of the old style radiators where you can look in and see the tops of the rad cores too but on a turbo motor i'd keep the expansion tank probably.
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual. [SIGPIC]
..I also have a 427 Cobra replica with an aluminum chassis.
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