Pardon...couldn`t quiet hear wot u said.
Standard exhaust will be OK for normal track days.
Designated quiet days are normally 98dB and you will be hard pushed to get through.
Normally expect 100 - 103 dB with standard exhaust. KEEP the clutch pedal to the floor and build the revs up slooowwwleee. It helps. Giving the noise marshall £20.00 soemtimes helps but is not guaranteed. Goodwood, Thruxton and Castle Coombe are strictest but Ken, Vidal and Sideways have all managed to get on track. Vidal nearly got thrown out as his curling tongs were rattling at 110dB! Regards Sideways Sid