My plan is to get the most efficient sized turbo with the largest intake that doesn't create too much lag and can hit relatively high boost for these cars.
I like what Milka did with the intake MAF pipe by enlarging it. I am open to creating an entirely new path from the outside air to air filter to MAFs and then turbo intake inlet. Here was his comments about MAFs.
Milka,
"Originally started with the RS6 MAFs but they maxed out at 15psi through the GTX30s. Hence I modified the stock airbox and mounting to accept B5 S4/R32 MAFs. These only added a little bit of extra air and anything around 17psi maxed out the R32 MAFs/sensors. So then went to the following setup with B5 RS4 MAFs. This is the home built intake, I have since added some brackets to hold things in place and painted the silver/grey intake ducts to Matt Black.
I then had some slight variations in the airflow so decided to change over to the A8 MAFs which are exactly the same as the B5 RS4 except they have flow straighteners on them."
Attachment 15919Attachment 15920
I am not really sold on his intake design as I see it here, but I agree with the upsizing of intake tubing.
I would love for the stock airbox to flow enough air. I would be extremely happy about that. I don't care about redesigning what doesn't need to be. But I am not convinced yet that it can flow 35psi. I am just making up a number but can it???? I don't know...