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2mm seals better at high RPM (meaning less chatter and less rotor housing wear). 3mm is stronger, but I can't see that ever being an issue for an NA engine (or a turbo engine that's been tuned properly, for that matter). In my mind the ONLY reason to use steel 3mm over 2mm is for cost savings: if your rotors are out of spec, you can have them milled for 3mm seals and reuse 'em. Carbon seals are lighter, so it's less of an issue if you're planning on using those, but the 2mm rotors are lighter, so I'd still use the 2mm ones.
Romulan_7: RB says that? That's BS, they work just fine in pre-'86 housings.
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Originally Posted by Benjamin Franklin
Those who would give up Essential Liberty to purchase a little Temporary Safety, deserve neither Liberty nor Safety.
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