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Will be buying USDM STi uppipe tomorrow but still bother by this issue. Are they the same cat less uppipe? If so, would it cause any problem for emission? Please help! Thank you all


WRXGOOooo
 

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The USDM STi uppipe is the exact same as the JDM, it is catless. Depending on your state you might have emission problems. As long as you have your other two cats, you should still pass emissions in any state.
 
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