Thanks lads,
All very helpful
I'm trying to avoid replacing everything by grafting the RC40 back box onto the existing SS single centre box original system. The internal dia. of the RC40 slotted stub is 44mm the external dia. of the tail end SS pipe is 38mm so just got to adapt a bit. Or I might try re hanging the existing system in a more compliant manner. Most of the noise is resonance at about 3000 rpm rather than outright
exhaust exit noise. In fact it's more bearable at higher rpm but everyone keeps getting in the way
Steve