Subaru 08-13 STI Downpipe

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In order to gives your exhaust a great flow and engine performance. an aftermarket downpipe is a must. By removing the restrictive factory catalytic converters and enlarging the pipe diameter, exhaust flow is increased considerably. Most aftermarket downpipes are available in catless or high flow catted options for you to choose from. Please note: Engine management will be required when installing any of these systems, so we recommend a tuning tool such as the Cobb AccessPort to properly calibrate ECU settings for the change in exhaust flow & back pressure.