Catalytic converters aren't cheap. Have a look a Summit or Jegs. Those places are the major suppliers for the Ford/Chevy/Dodge drag racing and hot rod set. Individual high-flow cats are about $150, before you start cobbling them into an exhaust system. Stainless tubing isn't cheap either - check prices on 7' tubing. I've been thinking for a while about building my own high flow cats, and it looks like the job would be around 500-600 bucks.
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