Catalytic converters are an essential component of a vehicle's exhaust system. They convert harmful gases such as carbon monoxide and hydrocarbons into less toxic emissions, making them safer for both the driver and the environment. In this review, we will take a closer look at some popular catalytic converter options available on the market today. The first product in our list is the Catalytic Converter for 2007-2016 Nissan Altima 2.5L L4 Direct-Fit High Flow Series (EPA Compliant). This catalytic converter is designed to fit directly into your vehicle's exhaust system, making it a convenient and easy installation option. It also features high flow capabilities, which can help improve engine performance by allowing more air to enter the combustion chamber. Another popular option is the MOSTPLUS Manifold Catalytic Converter w/Gasket Kit For Nissan Altima 2.5L 2007 2008 2009 2010 2011 2012 2013 674-933. This catalytic converter is designed to replace the entire manifold system, including the gaskets and bolts. It features a high flow design that can help improve engine performance and reduce emissions. The 90 Degree O2 Sensor Socket Real Mini Catalytic Converter is another option for those looking for a more affordable catalytic converter solution. This product is designed to replace the o2 sensor socket in your vehicle's exhaust system, making it an easy and cost-effective way to improve emissions and engine performance. The Catalytic Converter for 2007-2013 Nissan Altima 2.5L Direct-Fit Stainless Steel High Flow Series (EPA Compliant) is another popular option for those looking for a high flow catalytic converter solution. This product features stainless steel construction and is designed to fit directly into your vehicle's exhaust system, making it an easy installation option. The Catalytic Converter for 2007-2017 Nissan Altima/Murano/Pathfinder/Quest & Infiniti JX35/QX60 3.5L | Passenger Side | Direct-Fit High Flow Series (EPA Compliant) is another option for those looking to improve emissions and engine performance on their Nissan Altima or related vehicle. This product features a high flow design that can help improve airflow into the combustion chamber, making it an excellent choice for those looking to boost engine performance. The Catalytic Converter for 2007-2017 Nissan Altima/Murano/Pathfinder/Quest & Infiniti JX35/QX60 3.5L | Driver Side | Direct-Fit High Flow Series (EPA Compliant) is another option for those looking to improve emissions and engine performance on their Nissan Altima or related vehicle. This product features a high flow design that can help improve airflow into the combustion chamber, making it an excellent choice for those looking to boost engine performance. The MOSTPLUS Manifold Catalytic Converter w/Gasket Kit For Nissan Altima 2.5L 2007 2008 2009 2010 2011 2012 2013 674-933 is another option for those looking to replace their entire manifold system, including the gaskets and bolts. This product features a high flow design that can help improve engine performance and reduce emissions. The MagnaFlow 51206 Universal Catalytic Converter (Non CARB Compliant) is another option for those looking for a non-compliant catalytic converter solution. This product is designed to be used in areas where emissions regulations are less strict, making it an excellent choice for off-road or racing applications. Finally, the Walker 93253 Converter is another popular option for those looking for a high flow catalytic converter solution. This product features stainless steel construction and is designed to fit directly into your vehicle's exhaust system, making it an easy installation option. In conclusion, when choosing a catalytic converter for your Nissan Altima or related vehicle, there are several factors to consider. These include the type of catalytic converter (direct-fit, manifold, etc.), the flow rate, and whether you need a compliant or non-compliant solution.