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Cutouts and LT Headers

This is a discussion on Cutouts and LT Headers within the External Engine forums, part of the LSx Technical Help Section category; Just wondering if it is possible to put cutouts on a car that has longtube headers and cats on it ...

  1. #1
    Member Numba1TA's Avatar
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    1999 Trans Am WS6 A4

    Cutouts and LT Headers

    Just wondering if it is possible to put cutouts on a car that has longtube headers and cats on it that runs into a catback exhaust system. the reason I ask is b/c it looks like the cats hook up to the LT headers and wasnt sure if their is a way to put the cutouts after the headers and maybe just move the cats down further. If any of your cars have cutouts it would be great for u to post up pictures, thanx.

  2. #2
    Slow'er'Ass Mr. Luos's Avatar
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    Red Tint Jewelcoat
    2008 Trailblazer SS

    Not really.
    Not enough room for cats and cutouts.

    Besides, dual cutouts would probably lose power anyways.

  3. #3
    Member Numba1TA's Avatar
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    1999 Trans Am WS6 A4

    really, why do you say it would lose power? and thanx for the advice.

  4. #4
    Slow'er'Ass Mr. Luos's Avatar
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    Too much flow basicly.

    It might gain power at the peak, but it would be down on power under 5400 RPM's.
    Making the car slower overall.
    2008 Trailblazer SS
    Yank PTB3600, Kooks 1 7/8" LT's, 4" intake, E-fans, Magnaflow, Sonnax kit, tranny cooler, tune.
    Lowered, HID's, tinted.

    1999 Pontiac Trans Am WS.6 #1747 SOLD
    531.1 RWHP 481.3 FT/Pounds all motor.

  5. #5
    Member txz28's Avatar
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    dirty aka white
    2000 Z

    so runnin 2 cut outs is a bad thing? i was thinkin of doing the same install a cut out to the header then cat to the cut outs and to the muffler...
    so it would be like this

    lt headers...cut outs...cats....mufllers

  6. #6
    Senior Member INMY01TA's Avatar
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    2001 Trans Am (sold)

    Usually cutouts work best I believe further down like before the axle.

  7. #7
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    Psycho Therapist
    I take "the" out of

    cut outs

    This is like my setup, but i do have cats welded in after my lt. I have the magnaflow metallic spun cats. They are 3.5 inches at it's biggest and the piping is all 3".

  8. #8
    Powerstrokin LT1 > LS1's Avatar
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    best place to put the cutout is near the back of the car. in the tube before it goes up over the axle.

    in the big bulge like where the rear seats are. you can put a single one there

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