drewf
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Extract from Brands Hatch T&Cs:
"The initial test is a static test which is carried out using a handheld meter. Each car is measured 0.5 meters away from the exhaust at a 45 degree angle when the engine is being held at ¾ of the maximum RPM."
When you're at full chat, you'll be well above 105db!
Nah - possibly you might just make 108dB, if it's 105dB at 3/4 max rpm; it's not a linear scale. 110 is the typical pain threshold for most people - none of the cars will be anywhere near 120.