Internal upgrade of Dynaudio C4's

I am looking for anyone who has upgraded the internal wiring, and or, cross over caps in a pair of Dynaudio C4, non mark 2 version.

What type of cable used (copper, silver, etc)
What brand of caps used in the cross over
What were the sonic results and how did the upgraded speaker performance compare to the mark 2 version.

Thanks in advance!.

Regards, Jon