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What size headers?

This is a discussion on What size headers? within the External Engine forums, part of the LSx Technical Help Section category; I plan on putting new headers on my car this winter and I have decided to go with kooks headers ...

  1. #1
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    1998 Trans Am

    What size headers?

    I plan on putting new headers on my car this winter and I have decided to go with kooks headers and y pipe w/ no cats. Should i get 1 7/8" or 1 3/4"??? My car is stock except for an air lid and 3" cat back and i plan on getting a new cam and heads as soon as i get the money. I read that 1 3/4 is good on a mostly stock car but i plan on super charging my car later on down the road. Should i just get the 1 7/8" headers?

  2. #2
    Slow'er'Ass Mr. Luos's Avatar
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    Can go with the 1 7/8" tubes, but it may loose a little low end torque. Wouldn't be much.
    Doubtful there would be much HP gain until the very upper RPM's.

  3. #3
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    Ok thanks i will go with the 1 7/8". I was also looking at some hooker headers and they are alot cheeper than the kooks. Is there much difference performance wise between them?

  4. #4
    Slow'er'Ass Mr. Luos's Avatar
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    Probably not much performance wise.


    Although, the Kooks are top notch. I have had them on my car for 4+ years now, and they still look brand new. I highly recommend them if you have the coin.
    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
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    Ok thanks I will stick with the kooks

  6. #6
    Moderator 35th-ANV-SS's Avatar
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    Good choice!
    It's on jackstands.

  7. #7
    Member 408WS6's Avatar
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    Current best: 10.60/126.8
    1998 Pontiac TA WS6

    Kooks are the best. I agree, go ahead and get the 1 7/8 so if you buy a bigger cube motor later you'll already have a better header. Probably not much power difference if any on a stock cubed motor between the 1 3/4 and 1 7/8, but a 400+ cube motor you might gain 10 hp or maybe alittle more. American Racing Headers are good too, and alittle less costly.

  8. #8
    Member emoFTW's Avatar
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    99 Z28

    if your doing h/c 1 7/8 gets my vote

  9. #9
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    I have 1 7/8" kooks with catless y pipe and love them both i'm fairly stock as well but. Like luos said they still look brand new. I don't wanna nickel and dime anything when it comes to the car.

  10. #10
    Moderator 35th-ANV-SS's Avatar
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    What part of Chicago are you from? I'm about 30 min south of the city.

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