If you find a galvanised chassis one buy it.
If remapped, most are so depends how well done.
Cheap ones are cheap for a reason.
Avoid ones which look like they ramraided Britpart.
OK, so noises from the system can be,
Duff damper causing a sort of pump hammer.
Pipes rattling.
On mine I can hear something a bit like a groan when cornering hard, but no scraping.
It is a vibration?
Or a sort of hum?
Could be pipes vibrating
Missing damper in new pipe
Just pump noise
Mine makes a very low noise on hard cornering
Hose converted
Heard back, says they have in stock, none in stock.
Will have to buy a pile of SH ones and see what can be remade as the cases crack and mechanisms jam, as well as motors