whats the whole perpose of a down pipe? and whats that metal thread on it for? my car is not turbo charged but yet its got this on it looks like a turbo down pipe.... can i just cut it off and run straight pipe in its place?

3SGTE downpipe:


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A part of the exhaust system running down from exhaust manifold to the exhaust pipe in an NA car or from turbocharger to the exhaust pipe in a turbocharged car.

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Oxygen sensor on the top and EGT sensor for the main catalytic converter or wideband O2 sensor at the bottom.

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You are probably talking about a catalytic converter.

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so ur saying my car has 2 cause theres one by the exhaust manifold antheres one along the exhaust pipe under my car where it has that threaded section

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2 catalytic converters, not 2 downpipes.