Where’s the best place to get an cheap silencer. The one on my car gives out 103dBA according to the SVA man. Bit on the noisy side.
The engine is a 1700cc Kent running leaded fuel so it won't need a catalyser.
I would preferably want one which will quieten it down to at least 98dBA which I believe is the noise limit at Donnington

Try one of these

http://search.ebay.co.uk/search/search.dll?cgiurl=http%3A%2F%2Fcgi.ebay.co.uk%2Fws%2F&fkr=1&from=R8&satitle=db+killer&category0= />

Don't know what they are like through