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Thread: truck exhaust

  1. #1
    Member JUNIOR BUILDER
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    truck exhaust

    I got a 1994 gmc 1500 with the 4.3L v6. It's got a cat back exhaust system on it that y's about a foot past the muffler. Right before it y's at the connector it has cracked and is barely holding together right now. I don't have much money right now so I was just going to pull everything from the muffler back off and just spend a couple bucks on a turndown to put right after the muffler until i get enough money to get a new exhaust system. I was wondering how it would sound though, I don't want it to sound like some POS or anything, I want it sounding good. And will the truck perform any different? Also are there any disadvantages to doing this?

  2. #2
    Senior Member RACING JUNKIE
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    what muffler
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    Sam Wood

  3. #3
    Senior Member DYNO OPERATOR
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    I'd guess it won't sound or run much if any different.....

    Johnny

  4. #4
    Member JUNIOR BUILDER
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    All I know about the muffler is that my uncle who owns a NAPA store gave it to me for $20, it didn't have any name or any markings on it except which way the flow goes, and it's a 3 in. inlet and outlet. The original exhaust system didn't have a muffler and wouldn't pass inspection with out it so I just threw it on real quick. I wanted to take the muffler off but didn't have the pipe to fill it in with, I live in Maryland so it doesn't have to be inspected again.

  5. #5
    Senior Member RACING JUNKIE
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    3 in way to big for 4.3 but tutn down wont make it too loud when able do a 2 1/4 or max 2 1/2 with flow master muffler. that will be the best route do these all day
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    Sam Wood

  6. #6
    Member JUNIOR BUILDER
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    Really? why is that? I'm only 17 so I'm still learning, but it seems to me like bigger would give better flow giving better performance? Any help is greatly apprciated.

  7. #7
    Senior Member RACING JUNKIE
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    no back pressure need some
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    Sam Wood

  8. #8
    Senior Member RACING JUNKIE
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    Quote Originally Posted by dragonmaster093
    no back pressure need some
    X2, been there done that and was suprised.
    Dave
    http://www.racingjunk.com/profile/343797
    "All that is necessary for the triump of evil is for good men to do nothing" Edmund Burke

  9. #9
    Senior Member RACING JUNKIE DirkaDirka's Avatar
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    Quote Originally Posted by laxking012
    Really? why is that? I'm only 17 so I'm still learning, but it seems to me like bigger would give better flow giving better performance? Any help is greatly apprciated.
    Yeah if you go too big then you lose your back pressure or have too much back pressure and that can cause all kinds of problems. I have an 84 Chevy K10 with a sbc 400 in it and I have dual exhaust that is 2 1/2" pipe feeding into Flowmasters with it dumping down right after the flows just before the rear axle. Yeah it is loud when I gun it but normal driving it aint too bad. For a V6 tho you might want to consider around a 2" pipe if going with single exhaust. That should give you about the right amount of back pressure you need to run right.
    Its all fun and games till someone loses a nut!

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