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Haven’t seen any number but I remember Nick Taliaferro said something like the improvement was small. I would recommend a 3” downpipe, Viggen intercooler and turbo upgrade first before worrying about the header.
Eric
 

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you can always do custom
 

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I remember hearing "Ed" measured like 15 HP, but that was on a highly modified viggen.

When I discussed this with Frank, he said it was unnecessary until your pushing 400 HP. No info to back this up, but that’s what I have been told.
 
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