I read through the laser repair DIY (http://www.xoutpost.com/articles/all...-nav-unit.html) and am planning to use it to fix my dead laser on an mk3 unit in my 2002 M3.

I was wondering if it would be possible to upgrade my MK3 to an MK4 by just replacing the DVD drive inside with an MK4 version (PN 65 83 9 241 764). This is the DVD-M3-4.6 drive.

Would this work or are there other differences between the MK3 and MK4 other than the DVD drive itself?

Thanks.