A necessary item when adding more boost than the factory B6/7 S4 MAF can read. The PMAS HPX MAF sensor with 3.5” housing welded onto a 3.5” aluminum elbow. The elbow end is beaded and ready for use. This item comes with wiring instructions & butt connectors. These setup is good for up to an estimated 800whp. Turn around time is 1-2 weeks. Units are made to order.