No Mufflers- will I lose torque?

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No Mufflers- will I lose torque?

Postby BigBend » Fri Jun 08, 2007 2:15 pm

I feel pretty stupid asking this but, I wanted to keep my catalytic converter and no mufflers. Will i lose torque with the reduced back pressure or will it be impossible to notice?it would be on a 2002 silverado.
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Postby macdaddykeefer » Fri Jun 08, 2007 3:00 pm

it shouldnt make a difference if you keep the cats...my buddy straight piped his 05 from the cats back and all it did was make it louder
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Postby Smackaduck » Fri Jun 08, 2007 8:25 pm

I would not do that on your gasser. I think you will have problems with gas mileage and back pressure.
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Postby BigBend » Sat Jun 09, 2007 7:40 am

yeah maybe ill stick to the ol' flowmaster
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Postby fowl_wishes » Sat Jun 09, 2007 10:44 am

with an 02 model the cats offer SOME backpressure, but not as much as people think. the muffler(in my opinion) is still the heart of backpressure.

you will lose some bottom end torque and pick up some top end horsepower. but that is not what you nromally need for a truck. in a perfect world you could get a set of high-flow cats and a performance muffler.

but in reality, a good muffler and mandrel bent tubing works just fine.
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Postby KCDuckMaster » Sun Jun 10, 2007 6:27 pm

:dito:

I would get a set of Hi-flow cats and a good muffler. if you took them off you probably wouldnt notice anything, except for the tone. And if this is going to be a daily driver, an open exahust can get annoying.
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Postby noluck » Mon Jun 11, 2007 12:30 am

go to www.chevytruckworld.com you can find out a lot of info there bacause somebody else has already done it and they have nice after market stuff as well
I just don't get it
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Postby Duck_buster » Mon Jun 11, 2007 5:57 am

IF you take the cats off of a gasser the SERVICE ENGINE SOON light will
be your new best friend, OBDII cat monitoring will fail and put the truck in go to the shop mode
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Postby supr87gt » Mon Jun 11, 2007 9:02 am

You may gain a bit HP wise but will lose torque. The backpressure of the muffler's helps make the torque. I had a Mustang and you could feel the difference of the low end with mufflers on it.
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Postby waterfowlhunter » Sun Jun 17, 2007 9:26 pm

What about the cross over pipe, some call it an X pipe. The piece of pipe that connects the left an right bank together to equlize the pressure and incerase scavenging. My 2001 silverado HD has 2 converters into 1 muffler that combines the left and right. I am told that if I run duals from the cats back I have to install the "X" pipe or it will not perform correctly. Anyone tried it with and without this cross connect pipe?
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Postby Duck_buster » Sun Jun 17, 2007 9:45 pm

Waterfowlhunter,
I am an automotive diagnostic tech.
you could install a H pipe for scavage but performance gains would not be that great ,
cat back duals with quailty mufflers will do the trick either Flowmasters or Xcelarators will work just fine Pm if you have questions
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Postby supr87gt » Mon Jun 18, 2007 7:26 am

Im not sure about what the aftermarket world has for your application but you could look into a performance x or h pipe with high flow cats. Then slap on a set of flowmasters and it would sound pretty mean.
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