Noise testing in the West Mids

[d5hef]

Am doing a track day in March at Castle Coombe with a 100 Db noise Limit. I need to get my car noise tested before I go to see wheter I have to change back to a standard exhaust.

I live in Harborne Birmingham and am lookig for somewhere to noise test my car locally, to save a wasted trip to CC and wasted money.

Anyone know of anywhere?