Purchase Toyota 4 Runner Catalytic Converter Exhaust Leak & Toyota 4 Runner Exhaust Catalytic Converter Replace Toyota 4 Runner Catalytic Converter Prices. Maintaining your Toyota 4Runner's catalytic converter is essential for optimal performance and longevity. Regularly check for rattling noises, which may indicate loose fittings, and keep an eye on the exhaust system for unusual odors or decreased acceleration, signaling potential failure. To extend its lifespan, ensure your engine is running efficiently, as misfires can lead to excess fuel burning and converter damage. When choosing a replacement, consider options like two-way, three-way, or three-way with reduction converters, each designed with unique features to reduce specific emissions. Opt for high-quality materials to withstand high temperatures and consult a professional for proper installation, ensuring your 4Runner remains environmentally compliant and runs smoothly.