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The biggest cooling difference I've seen (having tried everything) is, without a doubt...
OIL COOLER.
I put together a ~$130 oil cooler/remote filter setup using parts commonly available, and my temps haven't gone above 220* (measured at the neck, so it's higher than most readings), even when mashing around @ full throttle for a while. They used to get up to 235* or so, making me want to shut down and take a break.
Currently, I use a cheap 2" aluminum "race" radiator, a 15" Permacool fan (which sucks a ridiculous amount of air, but doesn't sit flush, so I need to make a new shroud), no ducting (haven't made new ducts for the S14), and my oil cooler setup (mounted below passenger headlight).
Cliff notes: oil cooler, ducting. Cheap, and most effective. Do this (and a good water temp gauge) before upgrading to new radiator/fans.
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