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Thread: high flow cat worth it?

  1. #1
    honda
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    high flow cat worth it?

    im planning to free up some power on my jdm b16a and was wondering if a high flow cat is worth buying...im planning to buy a header to go along with it....will the high flow cat produce any noticable gain or will it not matter?

  2. #2
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    If you get a header with a 2.5" collector, you'll have to upgrade the cat no matter what. If you're not going to get a header with a larger collector, just use what you've got and save your money.
    2005 s2000

  3. #3
    Rotorphile. Kai's Avatar
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    If you like to hug trees, yes, it will give a minor improvement in the top end of the powerband.

    If you're not a hippie, a $40 test pipe will accomplish the same goal, only better and much cheaper.
    [SIGPIC]http://www.honda-acura.net/forums/image.php?type=sigpic&userid=281&dateline=1154763163[/SIGPIC]

  4. #4
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    Quote Originally Posted by Kai
    If you're not a hippie, a $40 test pipe will accomplish the same goal, only better and much cheaper.
    But it will stink and sound like shit.

  5. #5
    Senior Member b16ahybrid's Avatar
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    Quote Originally Posted by Shmoo
    But it will stink and sound like shit.

    who cares when you can gain 1whp

    For your application a testpipe is pointless. I wouldn't even bother with a high flow cat until you get more mods.
    5th gen civic coupe
    b16a turbo, 12.42 @118mph *sold*
    New project, 92 cx, Built b18c1 w/boost *for sale*
    2004 explorer xlt..

  6. #6
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    Quote Originally Posted by b16ahybrid
    who cares when you can gain 1whp

    For your application a testpipe is pointless. I wouldn't even bother with a high flow cat until you get more mods.


    I agree with the high flow cat. Until you have a reason for a better flowing exhaust, you shouldn't even bother. Shit, I even run the stock cat with my turbo setup.

  7. #7
    Senior Member b16ahybrid's Avatar
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    Quote Originally Posted by Shmoo


    I agree with the high flow cat. Until you have a reason for a better flowing exhaust, you shouldn't even bother. Shit, I even run the stock cat with my turbo setup.

    Exactly. Unless the engine can beinfit from the added flow, all your doing is making your exhaust louder.
    5th gen civic coupe
    b16a turbo, 12.42 @118mph *sold*
    New project, 92 cx, Built b18c1 w/boost *for sale*
    2004 explorer xlt..

  8. #8
    Rotorphile. Kai's Avatar
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    Quote Originally Posted by Shmoo
    But it will stink
    Not really. Not nearly as bad as everyone around here makes it out to be.
    Quote Originally Posted by Shmoo
    and sound like shit.
    Honda engines tend to sound like shit anyway thanks to their low displacement. A good resonator will do a better job to cure that then a cat anyway.
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  9. #9
    driver ED9man's Avatar
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    Quote Originally Posted by Kai
    Not really. Not nearly as bad as everyone around here makes it out to be.Honda engines tend to sound like shit anyway thanks to their low displacement. A good resonator will do a better job to cure that then a cat anyway.
    True and true, my car smells fine sans cat, and taking it out didn't make it sound too much different, resonator and muffler are more important. It'll only stink if it's running like shit. That and it still passed emmisions, so how bad can it be? Granted some of the levels were 3-4 times higher, but still it passed.
    sig

  10. #10
    Registered User civicandtegra's Avatar
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    i have a high flow and when the motor is mince and raced it smells like crap i wanna get rid of it, u know u could always take the cat and drill straight through it
    oh and when i first got my teggy it had a test pipe on it and it shaked violently and sounded just bad
    91 ls motor blew god rest her soul
    90 ls-parting or selling
    94 civic- show car

    "of course my car is a rice burner, u ever try to cook rice on a cyl head before its not easy" -me

    "no kids, no2 is really red bull to help make the mice spin the wheels faster in the motor" - chris swab

  11. #11
    Rotorphile. Kai's Avatar
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    Quote Originally Posted by civicandtegra
    u know u could always take the cat and drill straight through it
    I've gutted stock cats before. All it takes is a long screwdriver and a hammer.
    Quote Originally Posted by civicandtegra
    oh and when i first got my teggy it had a test pipe on it and it shaked violently and sounded just bad
    Violent shaking has nothing to do with a test pipe at all.
    [SIGPIC]http://www.honda-acura.net/forums/image.php?type=sigpic&userid=281&dateline=1154763163[/SIGPIC]

  12. #12
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    Urethane engine mounts, or perhaps a worn out stock mount? Or no flex pipe behind header, and/or bad exhaust system hangers?

  13. #13
    Registered User civicandtegra's Avatar
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    the shaking stopped when i got a new exhaust so maybe it was rubbing against the body
    91 ls motor blew god rest her soul
    90 ls-parting or selling
    94 civic- show car

    "of course my car is a rice burner, u ever try to cook rice on a cyl head before its not easy" -me

    "no kids, no2 is really red bull to help make the mice spin the wheels faster in the motor" - chris swab

  14. #13
    Honda-Acura
    Honda S2000

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