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What size pipe???

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by chaka73, Apr 21, 2000.

  1. chaka73

    chaka73 1/2 ton status

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    What size pipe should I go with for my duals to run my headers through, I went to a local muffler shop and I asked for the 21/2" pipe and the guy said "why do you want 21/2s" I say well for more air flow and more power the damn guy laughed at me he said that 21/4" is the same as 21/2s is this true, would I get the same torque and power with both sizes the price is the same for either one what would you guys recommend thanks by the way I'm going with Flowmaster 40s

    keep blazin !!!
     
  2. Toad

    Toad 1/2 ton status

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    What size is your header outlet?
     
  3. chaka73

    chaka73 1/2 ton status

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    I have 21/2" outlet headers.

    keep blazin !!!
     
  4. Grey Thunder

    Grey Thunder Registered Member

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    THEN YOU SHOULD GET 2 1/2 PIPES...

    " If it ain't a chevy, don't raise it up"
     
  5. MICHIGAN BLAZER

    MICHIGAN BLAZER 1/2 ton status

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    The customer is always right......go somewhere else to get your 2 1/2" pipe.

    <font color=red>MICHIGAN BLAZER
    <font color=green>89 Fullsize Blazer
    87 Cherokee
    65 IH Scout
     
  6. Jason73K5

    Jason73K5 1/2 ton status

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    Large diameter pipes primarily help wit high RPM horsepower. Fow low end torque, it's actually preferable to go with a slightly smaller pipe size. I have a 2-1/4" dual kit from Dynomax and have planty of power for my needs. It basicly comes down to personal preference and cost. I think that you'll probably be happy with any size dual exhaust over 2".
     
  7. hpfire7227

    hpfire7227 Registered Member

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    Let me know what you think of those flowmaster 40's. I'm considering them for my next purchase.

    10 BOLTS O' FUN
     
  8. '73 K5

    '73 K5 1/2 ton status

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    I think 2.25 pipe would be plenty for your truck unless you have a 500 horse mud bogger. Blazers are usually slow and heavy and could use the torque more. I have 2.25 inch pipes on mine with the Flowmaster 40's...I love it. Some people might say its too loud, but its good for me.

    '73 K5
    Chevy good...Ford bad
     
  9. SVBlazer

    SVBlazer 1/2 ton status

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    I've got the 2.5" duals with Flowmasters. You will have a couple of places that the exhaust will restrict depending on how you plan to install system. Most shops do not have mandrel bent tubes, so you end up with restrictions at the bends. So you might consider these restricted areas when designing your system....just a thought..
     
  10. Blazerbob

    Blazerbob 1/2 ton status

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    My exhaust was done with 2" pipe. I had some flex pipe with cherry bombs and now I have full exhaust exiting behind tires with turbo mufflers. It actually runs better now with more backpressure. Unless you have a extremely built motor you don't need a big exhaust.

    <font color=blue>Blazerbob</font color=blue>[​IMG]
     
  11. Tommy

    Tommy 1/2 ton status

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    I agree with most; you will get better torque out of smaller pipe, but you will get a deeper more mellow sound with larger pipes.
     
  12. NJ SAR Guy

    NJ SAR Guy Registered Member

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    Thank you, Snoop Dogg!

    NJ SAR Guy

    Please excuse all of my misspelled wurds.
     
  13. delta9blazer

    delta9blazer 1/2 ton status

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    first off, that title kinda got me. i thought this was a pot thread!
    anyway...
    the reason the guy said that the two sizes are the same is probably due to the fact that different industries measure things differently. you were talking outer diameter, he was talking inner diameter.
    or he was just a dick.

    <font color=purple>delta9blazer</font color=purple>
     
  14. BLzr4x4ngkid

    BLzr4x4ngkid 1/2 ton status

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    This thread helps me out quite a bit. So far I think I'll probably go with 2 1/2" pipe and Flowmaster. Hmmmm......Blazers being big and slow?!?! YEP!! HAHAHA When up to speed they are sometimes difficult to stop too!!

    "Crutch" Huckins
    What me get stuck? NEVER!!(Famous last words)
     

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