Chainsaw Repair

I appreciate the quick responses. 

Holman tree, you said you are planning to do a different muffler modification, what design did you have in mind for the deflector.  I like the idea of being able to keep the exhaust port behind the spark arresting screen.  Will this change require any changes to the muffler cover?

Thanks again for your time.

I haven't decided on a certain deflector cover yet but when working with the 338 today I can see there's not a lot of room for a much larger cover to clear the plastic shroud. From what I can see the cover has to deflect the exhaust like what the factory design does to avoid melting anything.
Once I get my new muffler in my hands and after cutting off the deflector can I see what will work. I'm thinking the deflector cover that's already on it may work fine, there's enough room underneath for a 9/16" -5/8" hole and still retain the screen. Cut it off , drill the 5/8" hole, solder cover back on, re install screen.