iirc the Koyo rad is 3" wide,. If your using your car for normal road driving and maybe the odd bit of track action I’d recommend the 2" thick alloy rad.
However if its high bhp and used regularly on track then the Koyo may be the better option Both are available on absolute radiators
the koyo is 53mm whereas the high performance brass/copper rad is 34mm which is still twice as thick as the stock one and can be at your door for $230 from memory, whereas the koyo is $460 to your door!
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