you mean as in a tranny swap...from steptronic to manual??? Look in your local junkyard, otherwise keep your eye on ebay and for sale section in this board....you can buy it new, but it will cost some $$$ bling bling..
FYI: I have reason to believe that the new transmission coming out in the 2004+ E46s is a modified Getrag Type D transmission you'll find in the current M3. It can then be changed to the SSG/SMG configuration, which explains their decision to go with Getrag for future marketing.
I personally enjoy the crisp, smooth feeling of ZF gearboxes. If you have driven both, you'll know what I mean. So, I have been tracking down information about the 6-speed in the new Z4 roadster, since it already bolts up to the M54 motors.
Since November, I have been speaking with ZF, Getrag, BMWNA, and BMWAG engineers about retrofitting a 6-speed transmission into manual 325/330s. It is coming along very nicely, and I will likely be able to offer the kit for around $3,000 including an entire brand new transmission. No conversions, all bolt up. I am still working out the details, so give me some time.
Also, I will probably work out a deal where additional optional items will include a Short Shifter, alternate rear final drive gears, and limited-slip differentials.
I am also looking into getting this to work with the older 323/328 E46s as well!
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