Invidia/RSR has made this revolutionary NO CAT turbo back exhaust for your 2002-04 WRX/STI. The downpipe and catback system join together giving you a 3 inch stainless steel system for maximum air flow. All 02 sensors are utilized to not throw any Check Engine Lights. The flanges are 1/2 inch thick and the system includes all hardware for easy installation. A bellmouth off the turbo is designed to maximize wastegate airflow and produce more power.
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