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E46 Xi Forum
The E46 XI was produced from 01-05 in sedan and touring body styles. Powered by either a 2.5L inline 6 in the 325xi or a 3.0L inline 6 330xi. Discuss all thing about BMW AWD E46 'Xi' here.

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Old 09-26-2014, 12:30 AM   #22
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Join Date: Jul 2014
Location: Manti
Posts: 33
My Ride: 05 330IX
Missed this=P Hopefully my help can still be relevant. So here's the deal the 330 has a very much different engine than the M3. The m3 has a 3.2 litter that will have very much different electronics making that kind of swap difficult. I have seen both an AWD m3 and a 330Xi with an M engine but both would be very costly/ time consuming. You'd really have to ask yourself if you really want to put that kind of money into your car. Hey if you really want to pull this off all the more power to you! Just do your research as best as you can first. One off projects end up being a mess without help from others who have done them before. In some cases at least.

Your transfer case and transmission would be interchangeable between the 330XI and 325XI. The diffs have different ratios so you couldn't swap only a single diff from one car to another you'd have to do both. But dimensionally they would be the same on the outside and would interchange. Keep the 325 diffs as they are lower and you'll get better acceleration.

330xi 6spd E46 Sedan AWD manual

325xi E46 Sedan AWD manual

Hope that helps mate! Good luck!
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