Having read a few posts on VW Vortex and Audi-sport.net, the subject comes up very often, but having your input certainly helps. My other question is, that with the SAI removed does it effect the pre-cat Lambda reading's at least when the cars cold, running rich? So once the car is up to to full temp the SAI is then redundant.
But if you can find the ebay link to the correct connectors, that would be great, I've scoured eBay and I can't find them. I fancy making up some like yours for when i first remove the SAI.
As for the N249 valve, my only concern is that the ECU is no longer controlling boost pressure with it's removal. But also gets very mixed reactions on forums. But you've said you noticed no difference there. So as I've also read, no two cars get the same outcome it seems.
I'll be interested to see more pic's when you get the chance to upload them