Armed- Nope, no discoloration what so ever.
It gets yellow on the outside from gummed up fuel.
Crazy- It will be hard to find a 3 port std Rody V12. The ones offered now are Roar and EFRA legal. Those will be a bit harder to tune and more expensive. Regardless they are rediculously fast. If you can't get one, the NS12 or RR12s are fine for $240 or so. My rody was $320 at the lhs. Other LHS sell the other versions for $259-$390.