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I am interested in buying a '91 525 or '91 535 but I am having a problem deciding which one. I would like to know which of cars has the best combo. My number one priority would be reliability and then power and performance upgrades. I really like the 535 but am hesitant due to its older tech build. Are there any common problems to look out for them? TIA. Hoping to join in on the discussion on my e34 as I decide which to buy. B