David
No, you’re not seeing that correctly, the “A” frame, not that the A is closed at the top, is mounted on the rear of the gearbox, not the chassis, so the exhaust system up to that point is still insulated from the chassis by the engine and gearbox mounts
The two rearmost mountings each side should certainly be mounted on rubber.
Tony Crook claimed that the use of mild steel exhaust pipes alongside stainless silencers made for a quieter exhaust system, but it perhaps as well to remember that he was extremely good at writing up his product
Good luck
Roger
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