Ride height & exhaust volume
 

Would raising the ride height by a couple of mm make the exhaust sound louder ?.

May seem like a daft question but when i was at oulton wednesday i failed the noise test, when i was there in june with the dsc day i passed.

No more mods, same pipes, same tester only difference was the ride height 2mm higher and it was damn hot.

could depend on where decibel meter is located if they have a static one by the track somewhere.
Air density could also play a factor and so will the exhaust packing which will be getting slightly worse in its job of silencing every time you take the bike for a blast.