Contoured for 3" pipe and CNC machined from 6061 Billet Aluminum. Fits the following Air Flow Sensors: Denso 22680AA310 and compatible interchange sensor part #'s 197400-2090, 74-50040, 5S2954 and SU6401, Denso 22204-0D010, non OEM sensor 22204-15010. Below is a partial list of cars that use these sensors.