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I agree custom headers in a big horsepower application really are a good idea.
What was the range of primary lengths you were able to put together?
Are you going with 4" collector?
What size motor etc?

My 511 has 2-1/8" x 32" x 4". But the front pipes are a few inches longer than all the rest. It was a compromise with my stock frame, torsion bars, etc. But I am very happy with the performance compared to off-the-shelf 2" x 36+ headers.

But I strip and re-paint every couple years to save the metal I spent so much time making (amateur).

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