Vehicles in Motor City Online could be customised for improved performance or for an individually adjusted appearance.
Each vehicle was placed into a series of Power Classes based on their power to weight ratio, which could be changed by modifications. It was possible to race against vehicles from any Power Class.
Performance Parts could be equipped by the player through the Parts Catalogue selecting from the Cars section. Each part was available with a varying price that depended upon the supply and demand of that item.
Drivetrain[]
Rear End
Transmission
Transmission cooler
Engine[]
Camshaft
Carburettor
Connecting Rods
Cooling System
Crankshaft
Cylinder Head
Electrical System
Engine Block
Exhaust Manifold
Intake Manifold
Lubrication System
Pistons
Valvetrain
Supercharger (Blower or Nitrous Injector)
Nitrous Injector
Blower
Air intake point (Air Scoop or Air Cleaner)
Air Scoop
Air Cleaner
Exhaust[]
Exhaust pipe
Muffler
Brake Sets[]
Front & Rear brakes
Suspension[]
Front & Rear Shocks
Front & Rear Springs
Front & Rear Sway Bars
Front & Rear Traction Bars
Wheels[]
Front & Rear Tyres
Front & Rear Rims
Chassis[]
Chin & Rear Spoiler
Body
Detail Shop[]
The fenders, bumpers, running boards and hood of a vehicle were the only non-modifiable parts in the title. Some Paint Jobs were rare and not purchasable in the Detail Shop. Cars with rare Paint Jobs could be sold at a large price up to the seven-figure range or higher.