Dont want to get anyone's hopes up too much but.....
I work for European Exhaust and Catalysts in Hampshire. We are one of the UKs largest manufacturers of replacement exhaust systems and Cats, not to mention suppliers of Lambdas, and every exhaust component you could think of, We supply Eurocarparts, and many motor factors over the Uk, Europe and international.
We do also produce small number of Sports cats, with a range of different sizes in 100-200 cpsi. We supply Miltek, Morgan and other well known brands.
Anyhoooo.... I am the one and only CAD technician at the company and I am thinking about knocking up some drawings for the production of a JDM fitment 100cell sports cat. To be available in 2.25 & 2.5".
Price I wont know until I chat with the production managers, but I'm extremely sure they will be cheaper than many of the ones available on the market for now.
I'm thinking if there is enough interest, I might start up a Group buy as it will be cheaper to run a batch of say 10-15 units.....
I will try to keep you lot posted in the near future.
Ali.