Locate Mercury Cougar Exhaust System Parts & Mercury Cougar Exhaust System Kit. Find Mercury Cougar Exhaust System. Maintaining optimal emissions performance in your Mercury Cougar is crucial for both environmental compliance and engine efficiency. Regular checks of the oxygen sensor and catalytic converter can preempt the need for untimely replacements, while signs such as decreased fuel efficiency and increased exhaust smoke suggest immediate attention. When selecting a replacement, choose from high-grade stainless steel or ceramic options, which offer durability and enhanced functionality. Ensure correct fitment for your Cougar model to facilitate smooth installation. Proper care and informed selection are the keystones to extending the lifespan of your emissions system, securing both your vehicle's health and your peace of mind.