The first 10 minutes or so is on the K&N filter and how it works.
Monkeypants Well Known and Active Forum User Non-VOC Member 7 March 2020 #1 The first 10 minutes or so is on the K&N filter and how it works.
Gene Nehring Well Known and Active Forum User VOC Member 7 March 2020 #2 Thanks Glen. very interesting.