I just pulled the motor out of my '99 miata since it spun a rod bearing, and am in the process of cleaning up the engine bay. I was wanting to know what that cluster of hoses and lines is on the passenger side of the engine bay, and is there a way to clean that up?

 

I think this is what you're interested in:
https://www.miataturbo.net/general-miata-chat-9/cleaning-engine-bay-how-much-can-i-eliminate-61077/

 

Do you need to pass emissions?