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What is benefit of "catalytic bypass"

Engine

Vehicle Information: Model: Carrera; Year: 1986; Body Type: Coupe; Engine (type, size, modifications): 3.2L; Total Mileage: 200,000;

So shopping around for 'cheap' increase in engine performance. Have gotten Chip (911Chip) which seemed to work reasonably well.In talking to (more knowledgable) people, some have suggested that I "..go with a cat bypass...do it yourself job..cheap..10hp easy..won't pass smog in CA (where I live)..but change back easy.."SO my question to you is, what exactly is a Catalytic Bypass, and what other pieces of the engine/exhaust do i have to change/modify/remove/add to make this happen ; what is approx part cost and what tools would i need (welding/cutter/cursing (good at last item, not so good at first two..); would I have to get the Chip reprogrammed to take full advantage?ThanksLennart

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