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  1. #1
    Registered timucin's Avatar
    Join Date
    May 2002

    exhaust : headers or merc style manifolds

    i have to make a desicion soon about exhaust system soon.
    -i already have water injected which caused lots of problems last year.
    -have another set water walled but they are not in very good condition and i dont want to wasit time in the middle of summer

    so i need to buy a new set but: headers style is expensive on the other hand mercstyle manifolds (with risers etc) are 1/3 price.

    -is there a huge performance difference between these two?

    my engine is blown bb 520 cu.

    thnx for help

  2. #2
    Registered timucin's Avatar
    Join Date
    May 2002
    note: mercstyle means not the stock ones. they look similar but aftermarket. like revolution marines

  3. #3
    Charter Member #1055/Moderator Charter Member GO4BROKE's Avatar
    My Boats:
    Sonic 386
    Join Date
    Feb 2001
    I  Voted
    Cross sectional area of the runners is more important in a blown application than the scavenging headers provide. I have a friend that made more HP with Stainless Marine manifolds than with headers. As long as you use performance manifolds I think the performance difference will be small. In general the headers will probably make a little more HP.

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