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We only ever bought a few catalysts from Janspeed so someone is perhaps being a little 'creative' with the facts. If you want to know so you can buy an exhaust made by the same manufacturer then I'm afraid it's not going to help that our exhaust fabricators don't make road exhausts. We do however use pretty much one supplier for road, Group N and recce car exhausts.
I only wanted to know who made it through curiosity, I appreciate it would not be suitable for road use- it wouldn't fit as they use spring/sleeve joins, as well as exiting on the right etc...