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The Samco 3 Piece intercooler Y-pipe kit is designed specifically for all 2002+ WRX's with top mounted intercoolers. This replaces the stock restrictive plastic Y-pipe, throttle body coupler, and bypass valve pieces with strong silicon. When raising boost on a WRX these parts are a must have. The stock plastic Y-pipe after long periods of heat are known for cracking pre-maturely. Causing boost to leak out of the intake and cause a lean condition.