The stock cast iron elbow and catalytic converter is a big restriction in the stock MR2/Celica All-Trac. This 3" mandrel bent ceramic coated downpipe replaces both pieces allowing for greater exhaust flow, faster turbocharger spoolup, and better top end power. We typically see 10 hp and over 20 ft-lb of torque. Includes factory O2 sensor hardware and second O2 sensor bung for easy wide band tuning. 3" collector gasket not included.