That 50% request is entirely subjective and you really can't expect a specific recommendation without speaking to an experienced muffler guy, regardless of the vehicle or engine.
FWIW, I recently had my CAT's scrubbed after they became so clogged they started to heavily restrict my engine power... which I was keenly aware of, having just swapped in a fresh reman. I think the muffler is either a Magnaflow or a FlowMaster but the p.o. installed it and it's holding up well enough that I haven't had to mess with it or I'd know for sure.
Once I scrubbed the CAT in the Y-pipe and replaced the other with straight pipe, the sound increased quite a bit. So did the smell... but still nothing like a stanky diesel. Sound increase is notable and significantly deeper/hollower... but, I can't really exactly say it increased by 50%... probably a little more. My only real point of reference for a loud exhaust is my '73 F250 w/a 360 FE, Heddman long tube headers and glass packs. I use it for plowing, firewood, etc. but my neighbor thought I owned a drag car or mud bog truck.
The Bronco sounds far mellower by comparison and pretty mellow when putting around but as soon as you step into it... you and everyone around will know it. I don't think it's that bad but I ride a loud Harley too, so you'd have to consider the source. I also rev unnecessarily at stop lights and intersections... because South Park taught me too.
Oh yea... I think this pipe is setup at 2.5", with an adapter to 3" at the muffler and 3" on out. I was concerned about back pressure and left it in a well trusted muffler guys best discretion.
And... for those that would question, I live in a rural area with zero emissions requirements, in WA state... if you can believe that.