I'm running a MK8 fan and love it to pieces. It's on a 306 Ford with a Votech supercharger. I run around 450 to the wheels. The radiator is a summit 1 inch single core for a Mustang app. Never gets above the 'N' on normal. If anything, it runs too cool.
I concur with the relay issue. Get a 60 amp. Make sure to use the best 10gauge wire and keep the relay close to the fan. That sucker draws some serious power on start-up. I just used a Painless Wiring 190 degree 'on' sensor and it works great.
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