Why would you want to disable the secondary O2 with the stock cat in place?
You've physically maintained emissions compliance, but caused your car to fail inspection for no performance gain. Makes no sense, that's why no one does it.
Depends on the setup...if it's a big turbo car and power is the only consideration, port the head for sure.
Our basic hybrid daily driver...nah I'd rather make a bit less power and maintain stock drivability.
Exactly, so when you port the head, you have manipulated the VE curve, and it now does not match the one modeled in the ECU.
I can't speak for all tuning solutions, but Maestro does not have access to the VE modeling.
Doesn't even have to be a K series, even an H22 head.
Between the head design and the thin wall blocks, our engines will never be one of the legendary 4 bangers. Great engines for 5-600hp, but a waste of time to go beyond that.
Head flow on this engine is absolute garbage. Hydraulic lifters and oil pump are both incapable of much over 8000rpm, but you won't make power above 8k anyway because of the head.
A 20 year old stock Honda head puts a ported EA888.3 head to shame.