I designed this MAF housing to fit my tuned Audi A4 B5 1.8T.

Stock MAF sensor fits this model (see photo). The sensor orientation is 90° to the larger upgrade MAF housing I had on hand, which is why I designed this piece. Check the orientation of your sensor to ensure this will work. I'd probably make you a design with 90° rotation of the sensor mounting for a couple of beers.

The ends are 80mm external diameter (I run a B7 airbox and 80mm pipe to turbo). Internal diameter is 73.5mm.

Printed in Bambu PAHT-CF (and PA6-CF as a spare, not used) and it has been eating tonnes of air daily with no issues.