Yes I just seen a nytro xtx at my dealer that had sheet metal or aluminum plate bolted to the top of tunnel protectors. They said it did help the icing up.
I live in flat land and rail beds and lakes and the 1.75 track has taken a beating unfortantly (riped and torn lugs) so going to down grade to a 1.25 track and studs for my area.
I was told also that the studs wouldnt clear heat exchangers at front. hench no tunnel protectors from factory.
I'll have to keep look out for Royal sale and see what there going for. for the track.