912UL Exhaust System

Check out this company CKT they have a very good reputation and product line. It is used on my Remos GX and people have commented on how quiet it is.

https://www.cktengineering.com/aircraft-exhaust-systems/index.html

Thanks, Garrett, for your quick reply. At this point I'm trying not to buy a whole new exhaust system.

I looked at CKT and some other companies but what I want to do first is identify the system I have on the plane. If that company is still in business I want to see if they have a different collector for me to try out. 

In Looking at the Photo in your opening post, it appears that "Collector" is the proper term.

It does not look like what you have is a Muffler system of any sort.   Maybe a mini Glass-Pack at best.

It appears to be not much over 2" in diameter and maybe 8" long.  ???

If the exhaust was actually muffled, pointing it at the prop would not be of much significance.

All pusher configurations have the exhaust pointed towards the prop.

Pusher aircraft tend to have quieter cockpits.

Take a look into those exhaust tips to see if there is any sort of baffling in place.

If you can see the ends of the 4 exhaust pipes, what you have is an open header.

If you are looking for quiet, you will need to invest in an actual muffler system.

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The Rans Aircraft Parts Manual shows that the aircraft was originally equipped with an actual muffler mounted sideways.

Rans Manuals.

S-12 Parts Manual