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Most 4-point setups would worry me far more than a proper harness bar on a track. Scrhroth makes one that fits the car without a harness bar (the Rallye 3) properly, and their ASM is the only way I'd even consider a 4-point... and I'm not sure I would on a track.
Your comfort level (and that of instructors if you're there) may vary. Don't even think about something that's not at least tested to handle submarining properly.
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