I would still get the timing tool. It's cheap (like $49 from ebay) and it's always smart to check timing before buttoning things up after doing that type of work, even if you think you didn't mess it up. It could save you hours of aggravation, and you will kick yourself hard for not doing that little step before buttoning up the engine.

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'05 E53 X5 4.4i, '97 E39 528, '07 E92 335i, '16 F86 X6M.