RE: BISSON MUFFLERS...
i've got a BCM Pitts on my moki 1.35... and whilst it's great... i can't help feeling it only cost about 37p to make and i paid 40 quid for it. it is quite literally an aluminium can with 2 pipes sticking out of it. maybe the reason they sent you a new one is because it's cheaper than spending more than 5mins repairing one. but maybe the retail price reflects the development costs or something... i dunno.
but when my plane hit the ground and it was split open in a couple of places, somebody at the flying field said "ooh i can weld that up for you.." a few days later i got it back... didn't look very pretty, but it works as good as new.
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cHris