I prefer a single tip. My custom MBRP 3" with Vibrant resonator, muffler and anti-drone counterweight is loud on throttle and mild around town. I am confident a recent speeding ticket opportunity ended happily because the officer inspected a Fiesta with one exhaust pipe tip that looked and sounded (almost) stock at idle. Lot to be said for discretion and polite conversation.
I spent a lot of time trying to fabricate an aluminum exhaust system before springing for the 409 MBRP. If Russ can design and fabricate one that is durable its a wonderful option.
I wanted more sound for track, but the MBRP had too much sound on throttle around town no matter what mods I made to it. I am currently on a Mountune 2.5" that is lighter than stock, quieter than MBRP, no drone at 80 mph, but have not tracked it yet. May be a little too quiet for track, prefer to shift by note rather than rpm meter, have to see.