Air Filters
#2
#5
Changing filters that often would easily allow you to avoid the pricier options. So either consider the K&N filters or use a quality aftermarket version like a NAPA Gold. The K&N is a one-time investment (plus costs for oiling the panel) and the NAPA units are in the $20 range. I have used K&Ns in the past, but have switched back to a NAPA filter for the Blue Cat. Did not see any seat-of-the-pants performance gains with the K&N in the Audis.
#6
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