This is the X-Force 3-Inch Catted Pro-Series Downpipe. X-Force designed this downpipe with a larger diameter and with smooth bends to allow the turbocharger to exhale those exhaust gases without any obstructed interruptions to greatly improve the turbo response and performance. A good downpipe is one of the more popular upgrades in the WRX as the factory downpipe is highly restrictive by design, and with a proper tune, there will be a good amount of power and performance to be gained.
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