I've recently just had my turbo back exhaust system installed, and there is some sort of flange that they have not installed which came together with the whole system. The link below is a picture of the flange. I'm not very familiar with this so any help as to what its for would be appreciated. The car is standard.

http://i40.tinypic.com/2wpsc55.jpg

Looks like an up pipe to me. Goes between headers and turbo. Don't bother with it until you change the headers.

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Looks like a point there to insert an O2 sensor.

What brand is it?

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Don't bother installing that up-pipe. Its mainly for 01-02 bugeye WRXs that have a cat in the up-pipe that inevitably breaks down and sends chunks of ceramic into the turbo.

If you have any other WRX model then its not worth the effort for zero gain.

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