Vehicle noiseis not measured at half throttle but under a rigidly defined set of rules. If you want to know more about it and the planned future regulations read
this .
To get to the actual db figures you need to scroll down to Annex III
It all makes mind twisting reading
That all makes very interesting reading but you need to detach the tests for COC from the static tests as they are achieved differently.
In section 4.2 it describes the static test conditions and equipment and without getting too technical these are the tests and equipment used to carry out roadside noise tests ( in the UK) on vehicles suspected of having either defective or non compliant exhaust systems. Currently in the Uk it is an offence to have a motor car up to 3,500 kg emitting exhaust noise greater than 82 db (A) or to fit an exhaust system that does not comply with the vehicle manufacturers specification. These tests are carried out at 50% of max power. My Morgan fitted with ( as far as I know) Factory standard exhaust on the 3 tests required logged at 92, 93, and 93 db (A). I'd be interested to know what the Sports Exhaust registers.
