Changes

==Negatives==

==Negatives==

Catalytic Converters create backpressure on the exhaust systems of cars, resulting in reduced performance and higher fuel consumption.  

Catalytic Converters create backpressure on the exhaust systems of cars, resulting in reduced performance and higher fuel consumption. <ref>https://pdfs.semanticscholar.org/cc4a/bf825af08f173796c52cf5234f457c84ccc0.pdf</ref>

==References==

==References==