Track Day Noise - A New Solution?

[David_Stamp]

I have just seen todays Merlin Motorsport information email which announces the new availability of a special 'Merlin Muffler'. How it would fit a Caterham I am not sure, (maybe OK only on a rear exit exhaust??) but I thought that it might be of interest for those that do track days to read about:

https://www.merlinmotorsport.co.uk/p/merlin-mild-steel-racing-muffler-m-ex-muff-4

Edited March 19 by David_Stamp
Spelling correction

[Miker7]

I've always wondered if a better solution would be an expansion box (empty chamber) to slow down the exhaust gasses before the standard perforated tube section. As no one does this on a normal exhaust I assume it wouldn't work but I don't understand why.