3" pipes or 2 1/2' with cutouts?

Mopar Racers Forum

  1. kanders

    kanders Well-Known Member

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    I'm going to order a Jegs or Summit exhaust kit and would like opinions. Should I go with 2 1/2" and use manual plate cutouts on race day or install 3" and leave connected for racing. 3" would be less to do come race day, 2 1/2 would mean removing the plates but sound better when racing.
     
  2. Poppabear

    Poppabear Well-Known Member

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    I love that sound
     
  3. pettybludart

    pettybludart Well-Known Member

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    I have 2 1/2 inch with cutouts!6 bolts and there off on raceday!
     
  4. 1968FormulaS340

    1968FormulaS340 Well-Known Member

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    You should get the pipe diameter that best fits your combo.
     
  5. tyler_s18

    tyler_s18 k-member

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    electric cut outs:) lol
     
  6. kanders

    kanders Well-Known Member

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    Me Too !!!!!!!! If all goes well I'll be hearing it in about 2 weeks.
     
  7. kanders

    kanders Well-Known Member

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    Yah, that's the direction I was leaning anyhow. Thanks, Kev
     
  8. stroked 340

    stroked 340 Banned

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    I have a custom 3" setup on my duster which exits with 2 1/2 tailpipes and factory tips,i also have dump pipes right after the collectors,testing i've found the car runs no faster with the caps open just a lot LOUDER....
     
  9. dgc333

    dgc333 Well-Known Member

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    Unless you are in access of 500 HP a closed 2.5" system will be fine for the street or race day.

    If you feel the need for cutouts there are electrically operated ones so they can be opened and closed with a flick of a switch.
     
  10. 73dart360

    73dart360 Well-Known Member

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    i RAN 3'' ttI ALL THE WAY BACK AND BOY ARE THEY NICE
     
  11. Locomotion

    Locomotion Well-Known Member

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    I was running open TTI headers with extensions for several years. A few years ago I installed a 3" TTI X-pipe connected to 3" Dynomax Ultraflo's ending at the rear end housing. After a little carb tuning and removing the 60 lbs that the system added from elsewhere in the car to get the car back to its previous weight, it was at least several hundredths faster than before!
    It worked for my combo. As the fine print usually says: "Your results may vary."

    I've gotten several compliments from the open header guys and I can just hear my Holley blue pump at idle. Why bother with cut-outs?
     
  12. kanders

    kanders Well-Known Member

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    The reason I was thinking 2 1/2" is also so I can use factory tips. Would there be an advantage to a 3" system when its restricted to 2 1/2" at the end? Kev
     
  13. kanders

    kanders Well-Known Member

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    Thanks for the input guys, it seems both systems work for different people in different setups. Hmmmm......eeenee meenee minee mo.
     
  14. 63dartman

    63dartman Well-Known Member

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    2 1/2" with cutouts on a 340 is plenty. 3" in my opinion is for big blocks.
     
  15. stroked 340

    stroked 340 Banned

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    I have factory style stainless tips on 2 1/2" tailpipes freeflowing exhaust restrictions are not a concern..3" for big blocks,not when your small block is putting out what most big blocks do or better...to each his own..
     
  16. Locomotion

    Locomotion Well-Known Member

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    The 2 1/2" tips would be a choke point.
    But don't some companies make OEM style tips for bigger pipes?
     
  17. SpeedThrills

    SpeedThrills FABO Gold Member FABO Gold Member

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    Way back in the day, I took a set of factory 340 tips and cut them at the point were they measured 2 1/2" (hope that makes sense), then had them welded to my 2 1/2" system.
     
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