[QUOTE=andrewwynn;Anti rattle upgrade and if it's the same as M62, the o-ring upgrade.[/QUOTE]

Can you elaborate or pontificate on the anti-rattle and o-ring upgrades?

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2001 x5 3.0 (sold with broken motor), 1990 e30 M3, 1991 318is, 2002 325i, 2008 335i Dinan stage 3 6 speed,