porndoguk wrote:i just used clear silicon on the yamamota rear section and it was adequate i guess adding springs is for piece of mind and that race look but rcv collars will surfice.

Rick

Never used silicon on my yamamoto and it doesnt blow at all, but guess it won't hurt.

Anyhow, just took a few pictures.

Yamamoto System



Stock System



Side by Side



Here is a stock Honda system next to a Yamamoto 1/2 system.

The Honda inside diameter with the gasket in place is near enough 35mm.

The Yamamoto inner diameter is 35mm too.

Hope that helps.

Domo arigato

Found some right sized stainless tube to weld on removing the need for gaskets