3rd cat delete decibel reading for track days

[GtheSheep]

Hi,
Wondering if anyone's had a noise readings taken after doing the 3rd cat delete (stock exhaust)? Or generally made it through track day testing with it on.
Have seen the video of the Brands track day with the axel-back Milltek, but wondering if the 3rd cat delete alone would end up outside of the track day limits?
Cheers

 

[Dragoon]

This video might help you out a bit. Flybys start at about 1:45 into the video.

 

[GtheSheep]

Hey @Dragoon , thanks for this!
Was helpful, I also ended up buying the same sound tester to give it a go, which wasn't far off.
Eventually I went down to Brands and had it tested, warm day, warm car, valves open had 2 readings @ ~4000rpm of 105.1 and 105.5 db, a week later (track day) it read in at >109db on a cold morning with the valves open, with them closed it was just over 100db (static limit of 105db), and then seems to have passed the drive by limits (92db) for the whole day, though it warmed up which may have helped.
So yeah, seems like with the 3rd cat delete, even with these limits the car is a bit on the edge for noise restrictions

 

[dbjames]

This video might help you out a bit. Flybys start at about 1:45 into the video.

Is the increase in volume compared to stock with cat delete only subtle or pretty marked please?