Remark Elite Spec Dual Tip Resonated Cat Back Exhaust SystemSimple, and to the point is the premise for our Elite Spec catback with single muffler canister and dual tips. High flow 3" mandrel piping, straight through design single muffler canister, and two double walled tips. The OE exhaust valve function is bypassed, and does not cause any check engine lights. The GR Corolla's 3 cylinder turbocharged engine produces a unique sound especially at start up, idle, and lower RPM range. If you like a subtle exhaust