Exhaust Pipes for TriBSA

[petetherev]

Hello, I’m new to this forum and I have a TriBSA I originally built more than 50 years ago using a CB32 Gold Star, frame No. CB3385 and a 1952 Tiger 100C, engine No 31540. I blew the Gold Star engine up chasing a 305 Honda.
Like a lot of youngsters of the day I fitted a racing seat, racing tank and I made a central oil tank. I also fitted a TR5 high level Siamese exhaust system and Royal Enfield front forks.
Since I retired, I have been slowly rebuilding the bike, using the original tanks and seat etc. I also want to fit a normal low level Siamese system, the TR5 does not fit that well with the tool box being fitted.
My problem is getting one that fits, the Siamese high level fitted with more than 0.312” clearance from frame down tubes.
Can anyone advise of  suitable pipes please? The exhaust stubs are 1.5” dia, I could fit sleeves to accommodate 1.625” dia. Pipes.
Thank you
Regards
petetherev

[Rex]

As it's a special I would think that the chances of getting anything to fit off-the-shelf are remote in the extreme. Sounds like a job for a specialist pipe strangler.

[iansoady]

Allden Engineering have a good reputation and are said to be reasonably priced but I haven't used them myself. They don't have a website but are based in Market Rasen.

[SteveW]

I've used Den at Allden numerous times and have been very satisfied with his work at a reasonable price