Gruß Mutze ... der auch bloß noch zur Adria fährt *riesendollfreu*

Nenne es lieber "Besserwissermodus".  

Hier mal der Auszug aus dem technischen Regelwerk zur Lautstärke der GT1

Article 5.7.2)
The noise generated by the car is not to exceed 110 dB (A) at 3800 rpm, or at three quarter maximum revs if less.
This will be measured at a distance of 0.5 m and at a 45 degree angle to the point of exit of the exhaust. All measures which are taken to ensure that the maximum noise limits are not exceeded must be permanent in nature, and must not be removed by the exhaust gas pressure.

Das sind exakt die gleichen Bestimmungen wie für die GT2!

Und hier der Auszug aus dem technischen Regelwerk zur Lautstärke der GT2 in Le Mans

Technical Regulations for Grand Touring Cars ("LM" GT2)
Article 5.7.4. - Noise level :
Dynamic sound readings will be taken during the 2006 events. The method of measurement and the results will be
given to the competitors for information.
As from as 01/01/2007 the sound emitted from each car will must not exceed 113 dbA during the qualifying  practices and the race. The measurement will be made at 15 meters from the edge of the track.
...