Slant Six Dual Exhaust

There is/was the Dutra Dual exhaust. Dutra is a founder of www.slantsix.org and you can find info there. At least one guy on ebay sells a steel header adapter plate that bolts to the head. You would need a shop to bend & weld tubes to that. There were a few commercial slant headers, which you see for sale on ebay sometimes. but insure not just for a truck.

I think the sound comes more from the camshaft. There was an Erson group buy years ago on slantsix.org (search). Since then, the price is high ($200?). Comp Cams has a solid lifter cam, you can find on ebay (~$130). Cheapest is to send a cam to Oregon Cam for a custom grind (~$80+shipping).