Rear braces make ZERO difference. I wouldnt waste your time.

As for tyres, i would have gone for Michlin PE2s or PS3s. much better than toyos.

What coilovers have you ordered? Personally, I would go with damp adjustable Koni shocks and Eibach Sportline springs. You need to look into whiteline rear ARBs. For circa £150, they are supposed to transform the handling.

Engine cover doesnt need to be on, its extra weight