The Peel P50 is by any means the slowest car in FH4. A 0.048L engine produces 4bhp and a total of 8Nm (6lb ft) of torque. Gives it a top speed at about 42mph.
It's possible to upgrade it to a 1.4L engine, about 300 bhp, all wheel drive, from rear wheel drive. And have it reach about 180-190 mph.