But I really don't think under bonnet would make a difference to the driving noise? Does it?
J
It will take the 'dwang' out the bonnet and does improve the sound (dampen the engine noise) outside the car, I didn't envisage a drop of noise in the cab specifically although it does make a bit of difference. My bulkhead is insulated inside and out and I can tell the difference with the bonnet open or closed. When it's closed the main source of noise comes from the exhaust which moves forwards when the bonnet is open. My girlfriend said the car sounds quieter (actually she said "less rattly"), when I get back from shooting @ 2am now the bonnet is insulated. Which for me wins ....