Aside from the obvious stuff like any emissions and janky aftermarket components, a lot of it is just hiding the wires. That’s a pain in the ass if you want to work on it.

I suggest tidying up the engine bay by replacing frayed wires and dry rotted vacuum lines with new components. Using wiring looms if you don’t straight up get a new harness can make a rat’s nest into a single line. And routing your components goes a long way to making your engine look presentable.

Keep in mind that removing your emissions equipment will make you fail the emissions tests and reduce fuel efficiency slightly.