REMARK Catback Exhaust. Subaru WRX/STI VA. R1 Spec Single-Exit TitaniumR1 Spec catback exhaust system was developed for those seeking maximum performance gains. This single exit catback exhaust system reduces back pressure restriction, and offers significant weight savings. The 3 inch diameter piping and low restriction layout helps the exhaust system breath by reducing exhaust gas back pressure. Our high flow straight through muffler canister creates an aggressive tone which might wake the neighbors but fits in
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