The 318ti uses the same case and design as the Z3.
Here a comprehensive guide to uninstalling and reinstalling on my website: http://www.bimmerdiffs.com/blogs/bmw...l-installation
Time range for a first timer is typically 3-5 hours, depending on how seized all the bolts are. This is my realistic time - not a "perfect world" time.
If you are using a used clutch based limited slip (not a torsen), you should replace the carrier cap bolts as a minimum to prevent future failure. 90% of the inquiries I receive are due to this failure. There's a load of good information on my site that could really help you.
If you have any questions, please let me know.
Best,
Jonathan Thayer
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