The one easy change I have found is the Go Westy Muffler along with their CARB approved Cat. This Cat is large (and expensive). Their muffler is a baffled straight through and it is well made. The price is fair and it is what I now install for replacements. 

Dennis

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of Mark Milby
Sent: Friday, March 27, 2015 3:53 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Cold Air Intake

With what seems to be the easiest horsepower gain, I continuously wonder and search for a good cold air/direct air intake.
Has anyone pieced together a K&N Filter system.

Just wondering.

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Mm