If your car fails a noise test during scrutineering at a trackday it has the potential to seriously spoil your day, not to mention leaving you out of pocket having paid for an event you can’t take part in!
Some years ago Merlin Motorsport designed their own simple supplementary silencer/muffler.
It’s basically a round box 4in in diameter, 8in long and it has a 2in perforation in the bore and is packed with E-Glass.
Merlin welds a short length of exhaust tube at one end and slip it over the exhaust.
The end cap on the other end is tacked on with four welds so it’s possible to grind out the weld and repack the E-Glass. See – MERLIN MILD STEEL RACING MUFFLER
The muffler can fit over the exhaust, in which case they’d cut a slot which allows it to be secured with a clamp. It can also be fitted inside the exhaust and secured by drilling a small hole and using a self tapper.
If you do this the scrutineer will require you to fit a hose clip round the exhaust tube and over the self tapper to make sure that it does not vibrate out.
More from www.merlinmotorsport.co.uk or call 01249 782 101 ENDS.