John,
I meant to say that I have seen numerous earlier V8 Bristols with exhaust tail pipes that angle downwards at the end, often with what I suspect is an aftermarket chrome tailpipe extension.
I should also mention that the Series 3-5 411s have a vent in the rear wings through to the cabin (beneath the rear parcel shelf) which could also have a bearing on why they had an exhaust ingestion problem in certain conditions.
A dodgy boot seal can be the culprit if there is any airway, regardless of how small, between the boot and the cabin.
And as rubbond said, exhaust smells can also be down to a leak into the cabin from the engine bay. Check the rubber belows on the accelerator pedal rod that runs through the firewall (it's basically a flexible seal).
Kevin
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