Option for muffler without glass

[aircobra]

i have a standard L24 resonator and done, but have overdone the muffler ( 18" oval), so you can;t even hear the engine

so have been doing a bit of research on keeping it within the 96 dba limit and

1. Hard to get anything for the standard 1 5/8 ( 41 mm outside diam) pipe

2. Need an oval  OC ( offset and centre holes ) to make it work in the dogleg with the universal mufflers like redback

3. i dont want the straight thru designs which all have glasspacks as they degrade over time

4. i removed the muffler and ran the motor without and while it was loud due to the resonator it wasn;t that loud. i measured under 96dba at the pipe

5. i probably just need to drop a couple of decibels and i'll be right

so ...

1. can i just drop another resonator or a hot dog at the back ?

hoping someone can help me out on this