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Discussion Starter #1
im building some headers for the 4v. i picked 1 3/4" thinking about volume flow pushing a 92mm turbine with a 27cm housing. obviously im wrong about the size. so i guess im going to make log style manifolds.

any good suggestions. final output will be 1200 or so crank hp. its about track times not dyno numbers.
 

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Discussion Starter #3 (Edited)
ill post up pics as i make them. i think im still going with the 1 3/4 primaries, but they will be stubs going into a stepping log. final step will be 2.5" so there wont be a collector.

i guess i could use the 1 3/4" "ovals to round" i've made and weld a 1 5/8"'' pipe in it and still 'log' the manifold.


i thought i had it all figured and i was told they are wrong. so its back to the drawing board a little.
 
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