I can honestly say I dont know, but your thread promped me to ask this question..
Why is the S4Rt?? Why isnt there an S4Rr, S4Rb, S4RSw etc..? Why is this particular color SOOO special that it gets its own designation instead of just being called a Titanium gray S4R? They never had 2002 748St's.. or 900SSt's..? I'm not hating, Its one of my favorite monsters of all time, I'm just curious.
/Threadjack over.