I respectfully disagree with the catback system, IMO they aren't worth the money these companies are asking. Not for just an audible sound and no real gains.
Unless someone is going to performance modify their truck, IMO their wasting their money.
Flowmaster would be my last choice especially the 50 series. Again that's my opinion and obviously yours is different.
I put long tubes, highflow cats, solo performance exhaust along with a magnason root supercharger and an enclose CAI on my 650 HP 2010 Camaro. IMO, that's performance.
Just my thought's not intended to ruffle feathers.
Mike