New Exhaust

[silverbullet]

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?

[fullthrottledan]

I would say that i would hook up the headers to the y pipe and just run a single.
It will sound good and give you the right amount of back pressure.

[RedHeartbeat]

Your PCM will freak out with true duals. Some of the backpressure is required for proper feedback. If you go with true duals be sure you have an x-crossover to fool the PCM into thinking the exhuast is going into a single exhaust. Though you have 2 O2 sensors before and after the cats the PCM expects all the spent gases to mingle at one point and uses the opposite exhuast pulses to draw the gases out.

[01Thunder]

Well I didnt throw any codes when I put my true duals in but I did notice some torque loss down low.
these 4.8L dont have as much torque as your 5.3L down lowq, but I was able to make up for that in other areas
It all depends on what you want to do.
if you had an extended cab, I would most deffinatly say go with the single exhaust. but with a single cab I say go with the true duals.
the x-pipe will give you some of the bottom end back. I have mine right before the mufflers.
I will post a pic later

[RedHeartbeat]

I ran true duals all the way back to a Flowmaster muffler with two 2.25 in and two 2.25 outlets. It saved the use of a xpipe and the weight of 2 mufflers. Sounds good too. The muffler is only 89.95 to the door from Jegs or Summit, can't remember which. Local suppliers wanted 129 to 189.

[Whistlin00]

you should try a dynomax bullet muffler

[silverbullet]

I have heard a NBS 5.3 with true duals all the way out throu 2 flowmasters. But if I put a true dual plus a X-pipe or H-pipe will it sound diffrent (then regular dual) or just give me more back pressure?

[01Thunder]

hmmm mine sounds pretty loud when I get on it. and is nice and mellow just driving around, but Im also in the cab and not riding right next to it

[RedHeartbeat]

when you run an x pipe you in all practicality have run it into a two into one but then into dual outs. Years of research has been done that proves the xpipe will give you better performance than truly isolated duals.