they cant touch regardless of what material they are made from. when do you recall a fuel or brake line touching the chassis on a production car? been there got the t-shirt
the iva rules are pretty simple if you approach them like this. Think would ford, vauxhall, bmw etc do this on one of their cars if the answer is no then it is unlikely to pass. it wont work for everything but its a good rule of tumb to work by.
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