28-04-12, 11:41 AM
From the testers manual, reasons for rejection (failure in other words):
2. A silencer that is in such a condition or is of such a type that the noise emitted is clearly in excess of that which would be produced by a similar machine fitted with a standard silencer in average condition.
3. A silencer marked ‘NOT FOR ROAD USE’, ‘TRACK USE ONLY’ or similar words
So getting an advisory is, as has been said, the tester covering his arse and, if you have a can marked as not for road use, a bit of tape over it will be a pass as long as it's not stupidly loud.
Full testers manual can be found here http://www.motinfo.gov.uk/htdocs/m1i00000001.htm
2. A silencer that is in such a condition or is of such a type that the noise emitted is clearly in excess of that which would be produced by a similar machine fitted with a standard silencer in average condition.
3. A silencer marked ‘NOT FOR ROAD USE’, ‘TRACK USE ONLY’ or similar words
So getting an advisory is, as has been said, the tester covering his arse and, if you have a can marked as not for road use, a bit of tape over it will be a pass as long as it's not stupidly loud.
Full testers manual can be found here http://www.motinfo.gov.uk/htdocs/m1i00000001.htm