Hey! I have an aftermarket airfilter and know some guys who have it too. It is well worth it if you have turbo and want to increase the power, no matter if it's diesel or petrol. You should get 2-5kW increase... If you want more, add a tuning chip and a throttle controller! However, you won't need any adapter for the install. Please see the pic below, new piping starts only after the sensor. From the front: