The Tower 46 muffler has no baffle. It is hollow.

It is a direct bolt-on to the 46FX and it will even look like the motor came with this muffler. The undulations in the exhaust stack are the same.

You will need to re-adjust your HS needle valve. You will have to screw it out some.

The muffler will eventually come apart on you if you run the motor hard. The usual fix is to run a piece of 2-56 rod all the way through it with double (locktited) nuts on both ends. Expansion is the problem here.

Tower is bad about not having them or various parts in stock.

Enjoy --- Jim