OK I have a 04 scsb 5.3, an as of now I am only running 1 flowmaster dumped. But I am about to add some headers soon. An so I was wondering, after I install the headers, what kind of exhaust setup should I run?

-1. Just connect the header into the factory Y pipe an continue to run the single flowmaster? (Witch I was told would give me the best performance an torque.)

-2. Or get a true dual straight out of each header with 2 flowmasters? ( I was told that I would lose to much back preasure an lose torque an power.)

So what is the full truth on this situation? An does anyone know if the X-pipe or H-pipe really works on are truck?(01Thunder, thout you might know) If so, how do I run it?