It's ok, I found this post by Fordie on the AC forum, only just got back out of testing it:
"With Thruxton being out for AC now, and after today's racing on ITV4, I have been asked a few times for the sound fix, so without you all having to scroll through loads of threads, here is the complete fix.
As far as I am aware, if doesn't break anything else ( everything working here ) and had no reports of anything breaking.
Unpack this in to the SFX of the Ginetta G55 folder. Make sure nothing else is in there.
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Now this is the "dangerous" part.
In your assettocorsa\content folder ( not the Ginetta folder ) you will see a sfx folder. Back this up, copy it come where else, just in case.
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Unpack that sfx folder in to your assettocorsa\content folder, and hay presto. This does work, as I got Andy Riches working today.
Any problems, shout me
Regards
Fordie"
This works, doesn't solve the suspension issue, but I'm about to get digging into that right now.