Some vented rotors (DBA make nice rotors), decent pads and fresh fluid
Unless you want to fork out for brembos and most likely still require fresh pads and rotors
Sounds like a heatshield rattle - I know you said you have removed the heat shield (I assume this to be the downpipe/turbo heatshield) but did you remove the shields on the headers also?
Fortunately it will all be hidden from the outside - it's more the concept of chopping up the car in general
I have done enough chopping on the racecar lol