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Discussion Starter #1
Hello again everyone just wondering IF i just bought a downpipe and did not tune it would i have idle/drivability issues. or could i just slap the dp on and be on my way.
 

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Super Moderator (Actually a SuperSpy)
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If your car is a US model you are unlikely to need a tune. You will need to deal with the CEL. Search CEL fix for down pipe.
 

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There is very little benefit to installing an aftermarket downpipe without a tune. It is unlikely that you will notice any improvement.

While SD is correct, the 2002-2003 WRX seems capable of supporting a TBE with no tune and few detrimental effects. However, a downpipe is a performance part and the car should be tuned accordingly. Any part that changes the airflow and/or fuel dynamics of a motor should be tuned to extract the full potential of that part.
 

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Premium Member
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There is very little benefit to installing an aftermarket downpipe without a tune. It is unlikely that you will notice any improvement.


^this


The point of an aftermarket downpipe is to be able to tune more aggressively.. that's where the power comes from.
 
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