I'm getting new heads for my sedan.
Wanting to put them in myself.
Am I gonna need to pull the motor out?
It looks quite difficult to get under there...

 

yes you need to take out the motor. its a pita and i've heard install will take about 6 hours. you wont get much gains either better to just save your money and time.

 

I appreciate it.
What do you know about plenum spacers
And also potential throttle body upgrades.
Fog lights?
'03 sedan?

 

get either 5/16 or 1/2 MD plenum spacer. 5/16 has more overall gains but 1/2 has higher peak gains from 5krpm to redline. throttle body spacers are debateable. i havent seen anything that said they gave any improvement

 

So 5/16 is more realistic?
The TB spacer couldn't hurt though...