RX8 variable delay wiper stalk. Lots of threads about these, prices all over the place, but a ten minute job once you have one. It was the first Mod I did to my NC. (Hmm the Search function has been “improved” it has become very unfriendly compared with previously so I can’t point you to a good post).
Ali header tank for the coolant to replace the aged plastic, threads about this too
My take on the Dave-Fab coolant tank here
Bonnet gas struts can be a nice addition.
How I did the bonnet struts, but in two goes, including a cautionary note on strut strength.