I still have the oem fitted radio/cd player in mine, but the cd system no longer works, and oddly I've never replaced it. I've always hoped to have a louder exhaust so it wouldn't be needed lol.
I do like the carbon wrap also, but wished actual real carbon was cheaper, as then I would do a lot of the interior in mine.
Good news on the RS seats, and I agree, the blue would look good in mine, maybe one day