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Old 11/04/2011, 07:57 PM   #1
91efcivic
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Default header design

can any one tell me the power difference on lets say a gsr with a 4/2/1 header vs. a 4/1 header?

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Old 11/05/2011, 06:33 PM   #2
95hellatukd
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Default Re: header design

depending on the finall flange size i would say the 4-1 is better flowing cuz its straight pipe to the flange (instead of spliting to smaller pipe like the 4-2-1) as long as the flange is a decent size ut that also depends on size of the piping also.

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Old 11/10/2011, 05:06 PM   #3
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Default Re: header design

Here is a quick basic understanding on the difference. 4-2-1 is low end and torque, 4-1 is more high end hp. If you're street driving and usually at lower rpm 4-2-1 is what you want, if your a circuit racing mad man, 4-1.

4-2-1 (try y) is more common and about 90% of the time the better option, provides better clearance along with easier install and removal.

Another thing to add, is its not a coincidence that all the top name people primarily make 4-2-1.


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Old 11/10/2011, 05:47 PM   #4
91efcivic
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Default Re: header design

ik about the low end power and high and power difference.. im looking to see proof of this and how much of a difference there is.. iv ran both set ups on my cars but to me doesnt seem like much of a difference when drive.. my strip/street ls/v crx build i might just have to dyno it with both set ups on it so i can post the power difference...

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Old 11/11/2011, 12:09 PM   #5
95hellatukd
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Default Re: header design

what other mods do u have cuz just changing a header on stock car u wont really feel a diffference.

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Old 11/11/2011, 05:26 PM   #6
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Default Re: header design

Quote:
Originally Posted by 95hellatukd View Post
what other mods do u have cuz just changing a header on stock car u wont really feel a diffference.
lol where do u start? itr cams, skunk2 dual springs and retainer, itr pistons with h beam rods gsr crank and a 100 shot.

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