Exhaust question

[zach1990]

I'm taking my truck in this weekend to get my exhaust welded back since a bracket broke and a weld is leaking. Now I've been doing some debating about swapping my exhaust from true duals straights to putting an x pipe with two aggresive mufflers dumped over the rear axle. The truck is a 2000 sierra with a 4.8 and didn't have a muffler when I got it. My question is would spending the money on a muffler cause a significant change in the power id feel from my butt dyno? And maybe a gas mileage increase?

 

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[Jsdirt]

A muffler's only purpose is for sound damping. Damping sound causes a restriction to flow, which eats power. If your after power, and not being quiet, then leave it straight.

 

Up here in the northeast we'd be fined into poverty for riding around with open exhaust. Make sure to thank the Lord you live in a truly free state.

[zach1990]

Alright thank you

 

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[Carder09]

I have been lead to think that a correct muffler on your system adds or keeps back pressure as to not lose that smidgen of power lost to straight pipes. On your true duals, are you runnin long tube headers also?

[zach1990]

I have been lead to think that a correct muffler on your system adds or keeps back pressure as to not lose that smidgen of power lost to straight pipes. On your true duals, are you runnin long tube headers also?

 

No its stock up to the cats

 

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[Carder09]

I got ya. Hell, if you want to wake up up that motor then throw some lt headers on then x pipe it with or without muffs. And if you don't have it tuned, go ahead and get the good ol' blackbear tune to complement the lts and liven up the truck.

[zach1990]

As much as I want to it just feels like it be a waste of money with 300k on this motor. I've day dreamed a lot about building one like u mentioned in the next few years when I can afford to swap the motor out

 

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[Carder09]

That is def. A good reason to not do the mentioned mods. Would probably hasten the death of that engine too so stick to the duals and fix your leaks.

[zach1990]

That's exactly what I'm thinking. She still runs good and tows good. Towed 4.2k lbs last summer w/o a problem. I want it to go as long as possible which is why I'm considering changing my exhaust

 

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[zach1990]

One more quick question about this. I've been researching dual in dual out mufflers since I have true duals already. Does anyone know if the dual in/out flowmasters have an x in them or is it the exact same as the others with just 2 entrances? And I already know most of y'all hate flowmasters lol

 

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[Carder09]

Check flowmasters web site, I know some companies have cutouts of there mufflers. Magnaflow might have the cutouts too.

[zach1990]

I saw magnaflows they x in the middle having no luck with flowmaster

 

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[Jsdirt]

You can buy stand-alone cutouts, either manual or electric, and just weld them on wherever there's room,

 

My buddy put a set similar to these Quick Time cutouts on his Dodge & I wired them up for him. Very well made - beautiful welds with billet guillotine slides instead of butterfly valves - all SS - quality that you have a hard time finding these days. Of course, your gonna pay for it .... $$$.

 

http://www.summitrac...exhaust cutouts

 

EDIT: The brand he bought was Doug Thorley.

[Carder09]

I personally would get the magnaflow. You will like it over the flowmaster

[Mckenzie]

You'll be right at the same mpg for muffler vs no muffler... i've ran my truck with stock muffler then a single in dual out Cherry bomb extreme then on to true dual's (with cats on) and no muffler and to be honest with you it has gotten the same mpg (maybe a little bit better actually?) and the power definitely still feels there... i plan on taking the cats off this winter