[domtoni]

Claudio,

If the car was mine, I would talk to either Rousch or Total Performance.
Total Performance
44050 Groesbeck Highway
Clinton Township Michigan
+1 586 468 3673
As I understand, John Vermisch's company runs the Ford racing technical line.

Both do excellent work.

Rousch UK SVA'd the Ford GT for the UK market.

Before spending any money on an aftermarket kit, I suggest contacting both of these firms.

Saluti,

Dom