In article ,
Seppo Sipil? wrote:

Hello all, I'm trying to find manufacturers of exhaust silencers for
typical Continental and Lycoming small-aircraft engines. I know of
Gomolzig, are there others?

I'm looking for officially approved silencers, preferrably such that
they can be installed to the original exhaust manifold.

S.

If your certification rules are like US rules, you will have to have a
STC for the plane and the engine.

Do you HAVE to have one?