4 into 2 system?

[Orcade-Ian]

Seen the pics at a much better scale - many thanks!
If they will come apart for postage that would be a big help but as the silencers are shot, it wouldn't be the end of the World if they were lopped off with a whizzer downstream of the Y piece.

I'll pm you later to discuss,
Ian

[Oddjob]

The 4 into 2 is really good for engine performance but only when the firing cylinders are matched to the exhausts, so 1 and 4 together and 2 and 3.