Alex
I fitted Noisekiller's self-adhesive kit to the underbonnet of my 1991 240 (so that's the bonnet the inner side of the front wheelarches (engine bay) and the engine side of the top of the bulkhead. All was well until...
My 240 seems to suffer from moisture under the bonnet all the time, so a few months in a couple of the bonnet panels had unstuck. Noisekiller were very obliging and were aware of this problem - they sent me two new panels and a pot of glue (Evostick somat - a bit like Dunlop Thixofix). All solved
I also sourced the Volvo mat that Clifford refers to (Skandix had one - at some price mind you!) and fitted that too
Both treatments have quietened things down a decibel or two. As has an electric cooling fan. So don't expect an earth shattering difference, but my car is certainly quieter...
Good luck, Nick
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