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  1. Join Date
    Apr 2009
    Posts
    31
    #1
    Guys, what's the difference between between a 4-2-1 and 4-1 headers? What's the advisable headers for jazz 1.3mt?

    Cheers.

  2. Join Date
    Jan 2009
    Posts
    5,577
    #2
    4-2-1 could add a bit of low to mid end torque.

    4-1 is best when you're more into high revs

  3. Join Date
    Aug 2004
    Posts
    22,705
    #3
    It'll all depend on primary-secondary length.

    There are long 4-1 and 4-1 hybrid headers that have the same torque-boosting capabilities as 4-2-1 headers... but the final decision on header type will be down to what your goals are and what space you have inside your engine bay. With the Jazz engine's exhaust manifold against the firewall, you don't have much room for long-tube headers, so you may have to settle for a shorty 4-1 or 4-2-1 design.

    Speedlab carries headers for the Jazz: http://www.speedlab.com.ph/ ...prices are reasonable for a plug-and-play system, and they have dyno results to prove the effectiveness of their design.

    You can also ask at http://www.hondaclub.com.ph/v4/home.php or http://www.jazzcityunited.org/ for the opinions of other members as to what's best for the Jazz.

    I would also suggest locally fabricated headers, but the exhaust side of the Jazz engine is a tight place to work in, and the muffler-shops may not be willing to undertake such a project, or may take a few days to complete it.

    Ang pagbalik ng comeback...

  4. Join Date
    Apr 2009
    Posts
    31
    #4
    Nicky, thanks for the input. anyway, what are the drawbacks incase i put a 4-2-1 on my car, what i mean is if something went wrong during the installation would it affect how the engine functions?

  5. Join Date
    Aug 2004
    Posts
    22,705
    #5
    Quote Originally Posted by jazzitup View Post
    Nicky, thanks for the input. anyway, what are the drawbacks incase i put a 4-2-1 on my car, what i mean is if something went wrong during the installation would it affect how the engine functions?
    No. It should not. Unless the installation shop incorrectly reinstalls your O2 sensor, there should be no problems.

    Some header designs will cause a check engine light because the O2 sensor readouts will be different, so it pays to do your research, first.

    Ang pagbalik ng comeback...

Headers: 4-2-1 vs 4-1