[tacomanoob]

I know this has been covered before I just wanted to make sure that my circumstance didn't have anything different. I have a flowmaster super 40 and just had the 2nd cats on the Y pipe deleted and the first cats (header cats) gutted. Threw a CEL about 10 miles down the road after leaving. I know the guys with longtube catless headers and y-pipes have O2 sims, do you think that having the first cats gutted is whats throwing the CEL (considering the 2nd ones are after the O2 sensor)?

 

[Roxspin72]

Yes...

Do you even have an O2 sim. I have one I can sell you for cheap if you need it. Never used it since I opted for the APR X-1.

But the 2 rear O2 sensors are there to tell the ECU that your front CATs are operating properly. If you gutted em, then yup the CEL will come on. Nothing too bad will happen, just might experience a bit of poor performance due to the CEU trying to adjust AFR in order to correct this issue.

 

[tacomanoob]

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