The E46 BMW 323i and 328i were built from 1999 to 2006. The most significant difference between the two are the engines, but there are other differences as well.
Engines
The 323i features a 2.5-liter six-cylinder motor that puts out 170-horsepower and 181 pound-feet of torque. The 328i has a larger, 2.8-liter six-cylinder that puts out 193-horsepower and 206 pound-feet of torque. These are BMW of North America's figures. The crankshaft on the 328 is forged aluminum, but the crankshaft on the 323 is cast aluminum.
Transmission
The 323i comes with a Getrag transmission. The 328i comes with a ZF gearbox.
Differential
The differential ratio on the manual 323i is 3.11. On the automatic and manual 328i it is 2.93.
Brakes
The 328i has larger 11.8-inch brake rotors in the front and 11.6-inch rotors in the rear. The 323i has 11.3-inch rotors in the front and 10.9-inch rotors in the back.
Interior
The seats in the 328i are four-way adjustable and have storage nets on the back. The 328i has aluminum interior trim, but the 323i has gray trim. The 328i has rain-sensing wipers in the premium package and an electric trunk release, but the 323 does not.
Exterior
The 328 has chrome and body-colored detail trim, a chrome crosshatch front grille and chrome trim around the windows. The piece above the front license plate is body color. The 323 has black trim.
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