I've got a SI/DO 18" Magnaflow Catback exhaust and I really like it. Sounds loud and mean on startup and when I get on it, and is prettymuch quiet at highway cruising speed w/no drone.
Wouldve got that Roush OffRoad like 281Screw has and like I had on my 2007F150, but Roush doesn't make em for the 2010's so went w/the Maggie. But that Roush was badass on my '07! I'd recommend that to anyone who has those model year trucks.