In my opinion it is easier to hide things and reroute things than it is to remove them entirely.
OP, I see you're in California. Unless you have a '75 or before car removing emissions devices can come back and haunt you when it comes time to Smog Check your car. That is unless you have a friend who is helping you pass.
If not you are at the mercy of the Smog Check Technicians and guess what, they have no mercy, they want your money. Anyway here is my cleaned up engine bay.