A way to turn off the "check engine light" if I do an exhaust upgrade

[David]

I'm going to do an exhaust upgrade with high flow cats. The shop said they will do it but if te CEL pops on it's not their fault. Is there a way to just turn it off? This is going to be on a 2014 Police Interceptor 3.5 Ecoboost.

[glock-coma]

Assuming you have a tune... Your tuner can program the O2 sensors off so you do t throw a code.  If your stock I don't think there is anyway around it.

[SHOdded]

Does your state do emissions readiness checks, David?  If so, turning off the CEL won't be enough.

[AJP turbo]

Does your state do emissions readiness checks, David?  If so, turning off the CEL won't be enough.

Exactly...This always seems to be left out....In theory, if the pipes are catted and they as efficient as the stock cats then you should not throw a CEL.

You can try o2 bung extenders or MIL emliminators but most likely they won't work. In fact I know they won't work on test pipes. But I have not tried them with catted downpipes.

The logic for determining catalyst efficiency with these cars is fairly intelligent. Even more so than my 14' mustang. I figured they would be the same but they are not.

Best bet is too stayed with the catted variety of pipes. You can have your cake and eat it too with catless pipes but it would take you investing in tuning software and most professional tuners out there will not be able to help you other than disabling your rear 02's which will make it so you will never ready your I/M monitors.

[David]

No there is no testing in my state. I just want to get the maximum performance. I was told the biggest restriction on an EcoBoost engine is air intake and exhaust.

[SHOdded]

Definitely, doing the downpipes first will get rid of the real bottleneck in that part of the system.  Then doing a CAI (move volume, insulate from engine heat)/catback may yield some gains, a cutout will get you some more.