This filter should be correct in dimensions for our 4/4 Sigma. I double checked it because around 8 years ago the K&N replacement was mentioned here on Talkmorgan.

original:

https://www.autodoc.de/mann-filter/961367


K&N:

https://www.sportluftfilter-shop.de/sportluftfilter/luftfilter_33-2877.htm

BTW I am back happy with using an original paper filter. Each to his own. Here are dimensions of the K&N mentioned. It is only not so deep, around 30mm vs 50mm of the paper filter.

https://www.autodoc.de/kn-filters/2...gVuP7y_gRLKPNwXA-kQqrPPzxg22hb6Jk1XVPL5V

'14 4/4 graphite grey