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Old 03-17-2013, 03:29 PM   #2
Scooby Specialist
Member#: 284792
Join Date: Jun 2011
Chapter/Region: RMIC
Location: Vanilla Valley, CO
2011 STI


What kind of engine management are you running? Do you plan on getting a catted or catless downpipe? People think because of the taper, the Cobb DP is going to be more restrictive. That is a misconception. You won't gain much if anything at all by switching to a full 3" DP campared to your Cobb DP. So to answer your question, generally no. You won't need to retune your car. Unless you run into boost creep/boost spike issues from running catless, your current tune should be fine (assuming you are actually tuned for the DP).
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RoadKillDMD is offline   Reply With Quote