Frank Codelli sells the Stebro muffler system for the Vanagon along with the
stainless steel J-pipes. Bus Depot also sells the Dansk J-pipe IIRC. The
Dansk has mild steel flanges vs. the Stebro which is all stainless steel.

I couldn't find the link to Frank's website. Perhaps he'll see your post and
respond soon.

It'd be cool to see a VW powered aircraft. The only one I've ever seen was
painted all red. I like the way you kept most of it polished aluminum.

BenT
San Francisco