Just put a Jones full boar performance 409SS 3" in and dual 2.25" out, 18" case and 24" total length on my 2014 5.7 hemi. They are slightly better than MagnaFlow and this one fit the stock exhaust. At idle it's low and at cruise it's louder than stock but has no resonance. I love there mufflers and have 2 of the 3" in and out on my duals on my show race car with a 521 and love them also.
Best part is they are cheap, $45 for a muffler that's 409SS and flows better and sounds better than magnaflow. It's a straight through design with perforated tube filled with sound deadening material. I left everything stock with the resonators and it's the perfect tone. Not obnoxious and not loud at idle but get on it and she purrs!