Stock exhaust noise level in DB

[f80m3driver]

Ok so I'm hoping either knows the answer to this, or is bored and generous enough to go and test their stock car for me!

I need to know what the DB level is for a stock gen 2 (or above for interests sake) at idle, and at 4000rpm, when you have the noise meter 2ft or so behind the exhaust.

This is to help pass regulations (in New Zealand).

Anyone got any idea?

[Fatboy 18]

I think its about 103db