Gunner, the noise level actually doesn't increase, it's the redirection of the sound/blast that some find annoying...
Gasses and blast are normally directed downrange, a brake changes that. The A3 does redirect some blast when compared with a bare muzzle, but due to the difference in design, it's not in the manner of the Mini Y... The A3 creates a different report that I don't find annoying... I don't much like the Mini Y, but love the A3. There is simply no muzzle rise with the A3. Kurt's A2 version is the same for blast redirection, the A3 was designed for 14 1/2" barrels to keep them legal... [;)]
Any sort of brake or flash suppressor is a trade-off, but the Kurt's brakes are well designed and seem to keep blast/report to a minimum when compared to most brakes on the market...