I have acquired this kit from ahead4healeys.co.uk some time ago
It was Stainless Steel and kit include Silencer- Tail pipe and Side exit, all Big Bore
now it is sell in separate manner in the ex4400 series for BN4 BN7
change is very easy from tail to side- I have make one simple bracket with TWO holes, at the Silencer exit,
one for the Side and one for Tail
https://www.ahead4healeys.co.uk/EXHAUST-pg91.html
SIDE EXIT PIPE - BIG BORE - S.S. - EX4410
after just one short test I have dismantled the side exit( it appear no so noisy and louder, but test was very short,I haven't idea what are the brain condition after a 500 km trip) I must pass one examination, as MOT, before put the car on the road, and side exhaust are NOT admitted
externally silencer appear very similar to MOSS as Rich Berman S.S: exhaust photo https://picasaweb.google.com/110087349657726745747/57AustinHealey?noredirect=1#5715778888303989202
Cheers