Well Vibrant has two styles… the standard round/bottle type or an ultra quiet type which I think is more oval then round. Bottle type would be louder obviously but whether it would give you the deep sound your after I couldn’t say. But splitting from 1 pipe to 2 for the exit would defiantly change the sound vs just a single pipe.
In the end… sound “in my opinion” can be trial and error depending on how you design the system or what kind of sound you want in the end. Changing the exit size or tip style can help to alter the sound. Size “width and length” of the resonator would come into play as well as the dia of the exhaust piping itself.