I'm pretty sure that user Koncealed had the SW before and now has the ATAK. He can vouch for loudness on the SW. The Borla Sport is the 3rd loudest in that lineup behind the ATAK and S-Type. Can't go wrong with Borla. I originally wanted the Sport until I found the S-Type was a little louder.
I recently picked up a Sony A6000 with a Sigma 19mm Art Lens and love it. My previous bodies included a Nikon D5000, D7000, and D600. I've only owned the 35mm 1.8 for crop sensor and 50mm 1.8 for full frame. I recently used a Zeiss 50mm 2.0 full frame lens on this A6000 and was blown away...
I can't get enough of driving mine. Recently put my Borla S Type exhaust on and people can't stop turning their head. I've had several people thumbs up me & tell me to rev it at stop lights. Best decision I've ever made switching to the S550!
The S Type is perfect to me. Almost stock-like silence at highway/cruise RPMs, but ohhh is the noise there when your foot gets heavy! Idle rumble is great also.