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Message: <blockquote data-quote="Mouse" data-source="post: 151799" data-attributes="member: 2204"><p>bro, i believe your 323i is running on original 16'. the side of your driver door will have a sticker recommending the correct upgrade size for your car (check if u have the sticker), to double confirm again on the sticker recommended size, u can use online tyre calcutator to determine the correct upgrade size (best to stay within 3% upgrade rule so u wont have much problem on your speedometer and overall diameter). i believe upgrading to 18' that is 2' bigger will not give u much problem if u stay between 3% rule. anyway, yours is a 6 potter with roughly 170HP which i think have adequate power and hence u will not feel any power loss (that is my personal opinion) anyone else care to provide their view?</p></blockquote><p></p>