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for most people, there's no real perceptible difference. I prefer 4-wire fets and installs because I can make them cleaner by running both motor wires through the back hole in the grip for rear-wired setups (and also not get my 16awg wire chewed by the pinion).
other people run incredibly demanding dsg setups with fets way more powerful than the merf on 3-wire installs just fine.
I think its supposed to be a matter of whether or not you want to use all new wire or rejigger your stock harness.
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too busy tinkering to play.
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