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Standard cup suspension (perhaps with cooksport or eibach sportline springs) are perfect for road use IMO.
Personally I would just refresh what you have.
Is a bumper off job.
They bolt onto the rear of the bumper, you will see easily enough when it's off.
I am pretty sure the sport and non sports are different.
It's nice and easy.
Cut off the raised tabs.
line up the centre of the splitter with the centre of the bumper. Get a friend to hold it/use tape to hold in place.
Wack in some self tappers (be sure not to detach the wheel arch liners)
Trim the ends down with a sharp knife to match the shaped...
I like it :D
I am not convinced that people following me are always as appreciative. Ha ha
On topic: with those symptoms my advice would be to visit one of the specialists listed in the traders section.