Just installed the ISR long tube headers on my coupe. Apart from a strenuous install, everything seemed to check out. Checked for leaks and didn’t feel any or hear anything while revving or driving. She ran super hard first few pulls after slapping them on, then the check engine light came on and has remained on. Anyone have any experience with these that can speak to this issue. I could be mistaken, but I thought these headers avoided CEL with the extended bung for the secondary o2? Any feedback or insight would be much appreciated.

 

My guess is your trouble code is a P0420 / P0430 (catalyst efficiency below threshold)

I don't know if this applies to you, but it seems like the 2011/2012+ ECUs are not tricked by the O2 extensions.
Most will get a tune and turn off those codes.

 

Yea will confirm the code today. I’ve got a 2014 Q60s so assuming your inference on the ECUs I’ll have this issue until my tune.

I’ve got ECUtek en route, but whether or not I can finagle a base map out of a very busy tuner will have to be seen.

Appreciate the insight, I’ll drop the code reading when I get it just for reference.

 

Here are the codes that came back. Anyone familiar with these?