Ignoring visual and front indicators/placement.
Is there any legal issue to not running front or rear bumpers?
Running without bumpers.
Anything that is part of the crash structure of the vehicle cannot legally be removed. Because the front bumper is tied to the chassis it has to stay, but the rear bumper is just bolted to the body, so technically it can go - although you'd probably need to argue the point with Mr Plod at some point.
F8B EFI turbo - Three pots and a snail.