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source: http://www.genuinemaserati.com/

Maserati Birdcage is a range of Maserati accessories designed for racing car enthusiasts. The Maserati Birdcage range allows the customer to personalise his car with parts which enhance its sporting characteristics, while maintaining a balance with the hallmark style of all Maserati products: innovation, sports and refinement.
Choose from our range of exclusive brake calliper and radiator grille colours or equip your car with sports accessories to feel even closer to the beating heart of Maserati race cars.

 

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there is very little available: wheels, colored calipers.
nothing that you cannot add on the initial built of the car.

i was hoping for more aggressive springs and suspension; meatier exhaust, etc etc.