| Being equally sad...
I hav two sets of ti termis 50mm and 54mm and the 50mm are 50 shorter. Having said that, they are much louder and I notice the longer 54mms are 105Db limited.
So maybe the extra length is down to noise restiction. Also the 54mm cans have a 50mm exit pipe
all very interesting
just off to polish my vernier ..... | 
Hybrid Mode
