A heads-up on Hengst vs. OEM. In my post #61 above I replaced my OEM with a Hengst H199WK. It fit well, had the proper number of ports etc.... however it made a hollow sounding noise every time I started the car. It was all good once up and running but that drumming sound on start-up was annoying to say the least.

So, I ordered the OEM filter 8E0-201-511-J and installed it today. All back to normal. I don't know if it was a faulty pressure regulator on the Hengst but I am pleased that my car now sounds normal on start-up again.

My advise is to stick with OEM filters for this since there is really zero difference in price anyway.