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.
This is what it looked like mocked up at home.
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. A8 MAF on the left.
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