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No louder than a standard system so a local copper told me. The problem arises when you ask how they know my exhaust is louder as Subaru don't issue any DB readings.
My MOT tester did mention that they are trying to bring in DB tests though but nothing as of yet.
Aah that's good to know as been getting abit of stick since I've put a new Haywood & scott system on my new age, which is a lilttle louder than my prodrive system ! Lol