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'99 OBS V7 STi Swap
850 Posts
Discussion Starter #1
Has anyone passed the DEQ test with an aftermarket cat-back on their wrx/sti? I have a COBB cat-back and a stock dp with the cat on my ej20g swap and just failed the test. The HC and CO were over on the 2000rpm idle test.

Anyone have any ideas? It passed back in salt lake so I don't see why it wouldn't here.

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