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I still run the Autolite Plats. I've tried Bosch, and a few others, but the Autolites still do the best for me, even with the MSD coil packs and DIS 4 ignition...
I order all my plugs for my jet ski's straight from NGK (buy them in bulk), and they had a set for the 5.0, so I have them in the garage also. I'm going to put them in sometime and see how they do.
My advice is stick with the Motorsports or the Autolites (their the same thing)...