Help! Motor install non start

[mr2by4]

am stuck in my install of a used 3.2 liter m96 motor in my 2001 Boxster S.
Donor was a 2000 Boxster S. The motor is back in the car and I attempted to start it before I put the exhaust, muffler and assorted braces back in place. My logic is that if I had problems I could save those steps in pulling the motor back out. I have a couple of coolant leaks to address, but the big issue is that the starter does not engage. Key in the ignition, power is on, accessories are on, turn the key and no change at all.
Is there anything that must be done from an electronic standpoint to reset ECU when the motor has been out or switched?
I have checked the battery and it is good. Even tried to use a jump box to help and still the exact same response. Key turns but the accessories and lights continue and no starter.
So here is what I have done.
I reconnected the two fuel lines on the firewall driver's side.
I reconnected the fuel rail return line at the rear of the engine bay passenger side.
I reconnected the power steering lines.
I have reconnected all coolant hoses.
I reconnected the harness to the ECU.
I secured the harness ground in the trunk.
I plugged in the AFM.
I reconnected the GP 14 to the chassis beside the secondary air pump.
I reconnected the b+ terminal to the ground strap.
Plugged in reveres sensor switch.
Reinstalled slave cylinder on the transmission
Reconnected secondary air pump.
Plugged in engine bay fan and secondary air pump to engine harness.
Reinstalled AC compressor and reattached fun clutch wire.
Reconnected brake vacuum booster.
What am I missing? Is there some devious reason why the mid pipes and muffler would need to be installed?
Thanks