The TYGA pipes make exactly 105db measured according to the ACU handbook. And there's the problem:

The ACU use a formula to calculate revs, which meant my bike was tested at 7200rpm.

The trackday geezers use 3/4 redline, which had me tested at 9000rpm on a trackday at Castle Coombe. The bike then made 108db and failed. Arse.
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MC21SP Plaything
BMW F800GS Bumblebee
Triumph 9551 Daytona Big boys toy
FJ1100 Sporting relic
GTS1000 oddball