I would make a list of what parts you will add to your 323 and what parts you would add even if you had an m. A lot of track guys will toss out the m suspension for example to put on coilovers... if that's the case, you won't benefit from that "upgrade" on the m... will you be switching out wheels? If so, likely won't keep the m wheels either.
So figure out what benefits you would get from the m and, if it's only power, consider a supercharger
| 435 HP 328Ci
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