Great idea. You could try this...

Performance
General Performance oriented Parts (Ex: Camshafts, Electronics, Air Intakes, Exhausts)
Miscellaneous and Appearance
Interior, Exterior and Cosmetic Parts (Ex: CF Hoods, Seats, Sidemarker Lights, Car Audio/Video, Racing Apparel)
Wheels, Tires, and Suspension
All Wheel & Tire related parts (Ex: Wheels, Tires, Coilovers, Lug Nuts, Camber Kits, Rim/Tire Tools)
Forced Induction
Everything Forced Induction (Ex: Turbo Kits, Intercoolers, Blowoff valves, IC Piping, Turbo Manifolds)