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Motorsports & Track Forum
From Auto-X to Trackday to Racing and Professional Motorsports – this is the place to discuss making BMWs fast

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Old 07-01-2010, 05:50 PM   #1
mousee
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Chassis difference

Is there any difference between an M chassis and non-M? If yes, what are their differences?
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Old 07-02-2010, 02:28 AM   #2
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Chassis or Unibody is pretty much the same. The drivetrain and cosmetic features is what is different from regular e46s and M e46s.
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Old 07-03-2010, 05:09 AM   #3
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which means I can turn my 325 into an M with a subframe to subframe swap! thanks!
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Old 07-03-2010, 08:35 AM   #4
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Yup - the chassis are identical
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Old 07-03-2010, 08:41 AM   #5
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So does that mean e46 M3 are more prone to subframe failure because of the extra torque?
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Old 07-03-2010, 09:00 AM   #6
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There is a very distinct difference in the rear between the Sedan, Coupe, and M3.

The sedan has the narrowest rear fenderwell, followed by the Coupe which about 10mm wider, and the M3 which is about 20mm wider yet.
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Old 07-04-2010, 04:27 AM   #7
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which is the fenderwell? Is it just to accommodate the wheels? Is it a removeable panel that I can replace to make everything match?
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Old 07-06-2010, 09:35 AM   #8
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Can it be done? - Yes, but it requires extensive body work. If you look at the rear fenders of your car it's not like the front where you can just unbolt the non-m and then bolt up the M fenders. You'll actually have to cut out the old and weld in the new. Search for Jeppe's non-m to M sedan conversion if you haven't seen that tread yet. He went through the process of doing that along with everything else needed to make his non-M sedan into an M.
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Old 07-06-2010, 03:47 PM   #9
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It's really a beautiful build.

Quote:
Originally Posted by tinkwithanr View Post
Can it be done? - Yes, but it requires extensive body work. If you look at the rear fenders of your car it's not like the front where you can just unbolt the non-m and then bolt up the M fenders. You'll actually have to cut out the old and weld in the new. Search for Jeppe's non-m to M sedan conversion if you haven't seen that tread yet. He went through the process of doing that along with everything else needed to make his non-M sedan into an M.
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Old 07-07-2010, 08:58 AM   #10
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^ and now he's supercharging it
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