The 4 pot kit for 330 and 350 discs are brembo off a Porsche and Audi. Cannot remember which one tho.

Wilwood are cheap because they are mass produced in the states and are no different to the Hi Spec stuff.

Do you really need to go that big on the rears?

Std good brakes on a road car is fine and will work well from 150mph and they don't stop you going sideways trust me I know......
I have had the big brakes and now I am on 4x4 rears and 2wd fronts with uprated pads.
Be carefull as only some will fit behind 7 spokes.