Matt,
Yep, got 2 '21s. Was wondering about the advantages of using the RS pgmII over a stock PGMIII. I've also got an HRC '21 harness to play with as well. Fonty has also referred to using this unit on an NSR.
I realise this post may be better in the HRC section (for the mods).
Of course, developing your own programmable unit would make all this irrelevant, and negate the whole issue of discontinued stock parts.
Scott