Forgive me as I am pretty new to this .. Lots of auto experience but just starting to dabble into the tuning world more.
You're saying I should run a 551L .bin which has been converted to bosch MAF and use a 551M .xdf ?
This has been covered at least 30 times in the past 2 months. Just do a bit of reading and you'll find it.
But yes, that is what I am saying. 551M and 551L share a definition file. 551L is tiptronic, flash it to your B-box after converting it to bosch by copying KFKHFM, MLOFS, and MLHFM from a bosch file.