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Discussion Starter #1
2004 Forester XT swapping in a 2006 STI engine. Need a down pipe that I can use with V39 turbo but pass CA smog.

anyone have an OEM STI downpioe
or aftermarket catted downpipe?
 

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20,436 Posts
What's wrong with your OEM downpipe?
 

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10,947 Posts
Zero aftermarket downpipes pass smog. They are 100% illegal in all states cats or not.
 
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