Not loud at all, I don't have the figures but from what I remember from researching it its within 2-3 dB of the stock according to testing, but a nicer note IMO. Doesn't drone in my experience, I had a decat apexi single exit on beforehand that was loud, raspy and got annoying so that's why I purchased this exhaust.
I got the intake, header and exhaust combo from senol here on the forum so if you want another opinion contact him :)