Originally Posted by FocusBoy58
still no check engine light and heres my theory... The Cats o2 sensor is put in one of the banks of the pipe and not reading all 4 so it doesnt show enough to make it go off. Or maybe the car just burns that clean.
It is direct injection and has a cleaner (more efficient/complete burn) as you likely know...but I think the first guess is correct, or at least a part of it. If it were really burning that clean without a cat they would have saved the money and just deleted it for you.
Nice work here FB, glad to have the info!