While we are waiting on a few remaining parts, we've chosen to get started on a few things and get them out of the way. First is the fabrication of the exhaust utilizing stainless steel mandrel bent piping, Magnaflow mufflers, and V-band clamps and flanges at all joints. To best expel the exhaust gases from the GT35R, we've chosen to use a full 3" setup with a 3" downpipe from the turbo to the rear axle, then into 3" splits out the back of the car. While the piping diameter is a bit large for the typical A4, once completed our A4 should be far from typical!