Update.......
The R is in the middle of having a new development exhaust fitted.
Full stainless steel system with 3 1/2" downpipe and 3" system. Lovely quality with even the flanges being made from investment cast stainless steel. Superb quality TIG welding too. Eventually it will have blued titanium tips to add a bit of bling to the rear. Should hopefully free up a few horsies. Sounds absolutely mental at full tilt!

