After market and stock headers... whats the big diff?
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Thread: After market and stock headers... whats the big diff?

  1. #1
    ..get to the bat bike! Array neli_boy's Avatar
    Join Date
    Oct 2002
    1989 gixer 750

    After market and stock headers... whats the big diff?

    Hey, my friend is looking into getting a new pipe for his 2001 gsf 1200.... right now he has the stock header, and is lookin into gettin a slip on, but he wants to know whats the big diff between a stock and aftermarket header...

    is the aftermarket one wider? as it it lets more air pass through?
    is there going to be a big diff of sound and hp if he take a slip on vs a full sys?

    is the full sys worth the $$?


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  3. #2
    Gear whore Array Kamui's Avatar
    Join Date
    Jul 2002
    2006 Honda CBR 600RR
    I know weight is one of the reasons... aftermarket ones are generally a lot lighter. They are also probably tuned in some way to improve performace of the bike, (however that works).. but usually only after you have properly configured your jetting or fuel injection.

    A slip on will usually bring very small gains in power, whereas a full system will produce more substantial ones. Again, this is only after the jetting/FI has been properly adjusted to the new hardware

    This should probably go into Bike techs and mods.
    (o'.'o) Thanks to Twinbros Racing for my avatar!

  4. #3
    Moderator Array Shovelhead's Avatar
    Join Date
    Mar 2005
    More Flow, less restriction = more power

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