if this is so that the MRT wont work on the RC4 decoder and the older amb's might thats an awful lot to change.
it also will kill the 2nd had price of an MRT, might be ok selling at a club that wont be upgrading the decoder, but on forums it will be worthless really
iv had the same mtr in my cars for three years and it has not missed a lap anywhere, even at herts where we get told there maybe an issue each time we go there