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Good points made on efficient exhaust being necessary. Often the original collectors utilized on a 427 car are duplicated in an attempt to maintain originality, but here in lies the problem, they create a huge amount of turbulence where the primary pipes join. Investigate a correctly designed set of Merge Collectors connected to a well sized muffler blank, and you'll have more horsepower to show for it.
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Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way 
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