So I have decided on Polishing the Aluminium intake into a mirror finish with a metallic teal valve cover, thanks to AMGtech for the idea.
However upon pulling the valve covers off I found something amazing.
Timing chain and top end were rebuilt or replaced fairly recently, it is absolutely beautiful. Unfortunately being a German car of the 90's almost every hard plastic and vacuum hose is rotted. It was swift before, but after I put it all back together I wonder how much power I was missing?