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I think you should wait until you find a good deal on used parts. I would get wheels first and then wait a while and get exhaust and tune. There will be more used parts available as people convert their cars back to stock before they ditch their M3 for something else. That is when I would buy a Akrapovic exhaust. Do it slow and enjoy it in small steps or the modding bug might eat all of your money. Also you are going to want to make sure each upgrade yields expected gains, so doing one thing at a time can be better.
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