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I have my friend a mustang 5.0 enthuaist and current owner of one. He says to run the car without the Catalytic Converter which he is currently doing. If I do so, even though I know it wont pass inspection, which isnt a problem ( i can get it passed anyways) Mechanically would I run into any problems down the road with or without a turbo? I plan on upgrading my exhaust system, and I dont know if I should run without the Catalytic Converter for small gain.
 

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You can also consider a high flow, performance cat. :cool: Giving you better flow over stock yet keeping a cat intact. There is not a very large percentage of performance loss in comparison, (Cat delete vs. Hi-Flo Cat)!
 

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Too much flow will cause o2 sensor problems. The ecu is programmed for the clean emissions and will go into fail safe mode when it sees altered emissions. This means the car will have less performance.
 
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