My 84 D90 RHD has a V8, The down pipes after the exhaust manifolds are leaking just right on the inside of the Y. There are some in the UK but I would like to see availability in the US. Muffler shop are charging too much to make them.
I would buy a rimmer bros or other stainless one and would make sure it was set up as a newer V8 but without cats (tubular crossmember). Someone has to be the US stockist for such things. Maybe Lucky8 or RN or AB.