This may help you locate them - here are photos of the cracks on my car that Gareth took for the warranty work to be done.

FYI mine was checked as follows:
November 2012:
No cracks

June 2013:
No cracks

September 2013:
http://img.photobucket.com/albums/07...ps5a848233.jpg

http://img.photobucket.com/albums/07...psf1ab8a40.jpg

Yes, I agree with you JBird.

I'm quite upset with BMW at the moment...

On top of their recent ugly designs and turbo-engine philosopy, they handled this problem quite badly.

I'm sometines leaning to sell my beloved CSL I confess...

Wow, that's impressive!

Thank you for the pictures Mike!

Call them cracks !! Check these out on a car thats been driven by Miss Daisy all her life !

few more..

Final one

BMW are having a fookin laugh saying that this doesnt happen and denying it in Germany ..then coming up with Technical Bulletins and stupid crazy foam fixes ... I may write a letter to them and say Im going to drive around in it until the floor gives way and kills me !:hahaha: ... then I will sue them :thumbs:

There speaks a man on a mission :hahaha:

They can't deny that the problem exists as they issued a worldwide memo to all Dealerships in 2003, advising them of what would be required to undertake their preferred fix eg. Plates and 2 pack Poly?Filler! :(

Did BMW suggest plates in the memo? My understanding is that the BMW fix is to replace the floor, and the option of the epoxy resin injection on one side

I've heard that the new floor they put in is the same as the original E46 M3 convertible one which is stronger. No idea if this is true though...

There is only one part number for M3 E46s.
http://mfans2.com/parts/catalog/41117000246/