Years ago when I was modding my E46 a very knowledgable shop owner/auto tech/BMW guru advised that I put in a front sway bar but not a rear sway bar. I did as he advised and it was one of the best mods ever. The car really flattened out and understeer pretty much disappeared. Later on I added a rear sway bar because I found a used one for a good price. The ride quality really went down after that and I didn't even really feel a difference in the handling/body roll.
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