I have a 08 Mitsubishi Eclipse Gs with 170,000 miles. The car is not a rusted anywhere and it does not have any dings. The car fax shows immaculate repairs by previous owners and myself. The car has matching cooper tires with new tires in the rear axle. I have experienced a check engine light that goes on and off for some time with codes P0421 and P0431. I tried cata clean and it did not work on my car.
Would you recommend OEM exhaust manifolds and a downstream catalytic converter?Aftermarket cats or headers with a high performance rear cat? The car has three catalytic converters. The exhaust manifold has the integrated catalytic converter and the cat converter on the rear of the car.
The OEM route would cost me roughly $3,000 with OEM O2 sensors, the header route would be less, but I would have to deal with O2 sensor problems. Would I be better off just selling the car ?