The twin pipe not only helps flow due to its size. The two smaller pipes
help maintain velocity and scavenger action. If you look close the dual
outlet manifold and twin downpipe is really a 4 into 2 into 1 design just
like some header exhausts.

Dennis

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
Jim Arnott
Sent: Saturday, May 26, 2012 5:22 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Exhaust solutions for inline convert

So let's talk about what's working for headers on inline conversions.

ABA. x-flow head. 50 degree.

Stock twin downpipe manifold doesn't foul motor mount but it's uncomfortably
close. So besides Don Hanson (who's sent me a ton of pictures), who's had
some success in building an exhaust system that didn't require frequent
crack repair?

Suggestion has been made that there might be a suitable single pipe
manifold. Fox? By my calc's we need about a 2.25" dia pipe to equal the flow
of the twin.

Muffler is going to be mounted as diesel-vanagon.

Pointer toward pictures would be outstanding!

Alistair, do you have pics of Frank G's system?

As always,

Thanks in advance

Jim