This is not an answer to your question as I supply Ferrita Swedish made fully stainless systems.
You can get a BSR system from Nordic or one of their stockists, or you can get the exact same item from the actual manufacturer's importer Jetex and branded as such in Leamington Spa or one of their stockists.
I supply the fully stainless Ferrita cat back system for £295 including VAT.
You may well find that the BSR/Jetex item is offered cheaper but is not stainless.
I give an unlimited warranty on the Ferrita system for as long as you own the car to which you first fitted it.
You can check
www.ferrita.se
Regards, Don.Norchi.