The SS back box with a stock mid-section I'd imagine is fairly mute but StoneNewt has a sports cat, straight through mid-section and CSC manifold in front of a SS back box which produces a nice rumble at low-rpm.
Also don't discount custom exhausts, my Sei is a Powerflow custom item from the mid-silencer back and that has a nice burble to it, only cost 130£ fitted.
Also don't discount custom exhausts, my Sei is a Powerflow custom item from the mid-silencer back and that has a nice burble to it, only cost 130£ fitted.