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Nothing wrong with williams brakes, good enough to stop a mk1 clio cup race car for 20 lap competitive races.
The only reason i can see to upgrade is to save unsprung weight or if you are running a lot of extra power thats going to generate a lot more heat when stopping.
Some people sell wilwood kits that fit the standard discs. Dynalite caliper (2.5 lbs) and all you need are a mounting bracket, longer hoses and pads.