A properly maintained 100% stock 2002 will have no problems in normal operation - there was plenty of traffic in the 1970s. Improving the suspension or drivetrain is fine if that's what you want, but the stock setup is perfectly adequate. Only the cooling system might be a bit marginal for your summers, but the late E21 radiator and a fan shroud pretty much drop in and will solve your problems. Other than that, upgrades are simply not necessary (but may be desirable).
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