SST60 Specs

[Sam La Banco]

A round pipe would be more effective in calculations, but there no sense making the tuner round after the first part of the exhaust system (in this case, the exhaust manifold) has a different cross section. Most probably for space savings and ease of manufacture reasons.

The most important tuning getting done in a 3 or 6 cylinder outboard, happens in the exhaust manifold. (inter-cylinder tuning)

[Fast Fred]

180deg is too hot, 140deg is where you want it. moded each one, the solid molded case is nice, the SST case ported up nice as well.