What's the cheapest way to install and exhaust system on a big block a body

Mtrhead said

Or do manifolds need to be a matched pair?

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I guess it depends on you. "I" would want a matched pair.....or AT LEAST two HP manifolds since they have the larger outlets. That way you could at least run 2.5" pipes right off the manifolds. The non HP manifolds have like 1 7/8 outlets. Not very conducive to any kind of performance.