Okay got the Tig back from Mike.
RNS is coded and works beautifully.
Apparently it was quite an annoying one to do (maybe because it is from UK)
MY10 model tiguan's apparently have 2 oxygen sensors (1 t the top of the downpipe and 1 near the end) so they are modifying the prototype downpipe for me to match my Tig and then it should be ready to go on next week.