Greetings . . .

Interesting idea - not sure how practical given the layout of the ports. One would need to join the two extremes and split both siamese openings in half with tubes into into separate collectors. With these three concentric Y's it would be crowded under the intake.

Also, with just two cylinders per collector one would need to run very narrow tube diameters to get any amount scavenging between exhaust pulses. Even then low end throttle response would probably suffer.

To the engine this set up would look alot like zoomie headers.

No idea how it would sound.

regards,
stock49

[Linked Image from 49fastback.com]