Not sure about carbonfibre I think it is normally done with a wire mesh - aluminium or galvanised steel.
I just did mine three days ago.
Some photos
More photos
Here's the procedure for doing it on a 9-3, which I daresay is the same for the 9-5 -M01
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[*]Separate black plastic rear section of grille from front chrome section.
[*]Cut out fins.
[*]break countless dremel grinding discs
[*]break you last remaining hacksaw blade
[*]smooth remaining stubs.
[*]Sand smooth so that theapertures on the black plastic rear section now match the ones on the front chrome section
[*]place mesh in back of chrome section and cut to size with side cutters.
[*]Optionally glue mesh to chrome (I didn't bother)
[*]Reassemble rear black plastic section against chrome front section whilst sandwiching the mesh section in between the two
[*]Take it apart again when you realise you forgot to replace the rubber bit that runs underneath the chrome
[*]place rubber bit along bottom of chrome section
[*]Reassemble rear black plastic section against chrome front section whilst sandwiching the mesh section in between the two
[*]Cut your fingers and thumbs trying to squeeze the whole thing back together
[*]replace grille inbetween headlamps.
[*]Stand back and admire new sporty grille
[*]Take out for a road test to ensure that the upgrade works as expected
[*]Take some photos to stick on Saabscene
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Expect the entire procedure to take four hours including a lunchbreak and two cup of tea breaks. It really does take a long time to get the existing fins removed.