This.
My partner hated the resonated version on both the N/A and the Turbo. The car was loud on the N/A kit and wasn't appreciated by heathens when on cold start. Generally couldn't listen to the radio without it almost being at full volume.
I've only had the SR on the turbo, and is fairly quiet, listen to the radio on cruises, and allows you to hear the turbo do it's thing. It's also quiet enough to meet noise regs at tracks like Bedford (or I wasn't warned about it) but I know it was near the limit at Oulton Park on the N/A with the resonated.
Personally, I would get the SR.