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Hello everyone and greetings. I've been reading a lot and an occasional YouTube video here and there and a lot of you guys are stating that when you delete the cat it's best to get a fuel management or Dyno tune.


I have a coffmans slip on, but was looking into deleting the cat as well. Now from what I noticed, the o2 sensor is BEFORE the cat, not after (unless I missed a second one). Wouldn't the ECU fine tune the fuel trim even if I were to remove the cat?

Thank you for your input...
 

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As I understand it, the basic problem is that the bike runs lean stock, cat removal makes it even more lean, and the stock ECU just isn't preprogrammed to handle the modified state. Ideally, yes what you are thinking would be ideal.
 

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Partial throttle it will compensate (to a certain degree) but at wide open throttle the ECU will ignore the O2 sensor readings ....that is the reason you need to reprogram

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