Exterior Dimensions , Wheelbase (in./mm) 110.5/2808 , Length (in./mm) 200.0/5080 , Width (in./mm) 73.0/1854 , Height (in./mm) 57.5/1461, Interior Front Dimensions , Headroom (in./mm) 39.2/996 , Legroom (in./mm) 42.2/1072 , Shoulder room (in./mm) 59.0/1497 , Hip room (in./mm) 56.5/1435 , Interior Rear Dimensions , Headroom (in./mm) 36.8/935 , Legroom (in./mm) 38.4/975 , Shoulder room (in./mm) 58.9/1496 , Hip room (in./mm) 55.7/1415 , Capacities , Passenger capacity Base - 6; Impala LS - 5 , Passenger index (cu. ft./cu.m) 104.5/3.0 , Cargo index (cu. ft./cu.m) 17.6/0.5 , Fuel tank capacity (gal.) 17.0 (approx.) , EPA interior index (cu. ft./cu.m) 122.1/3.5 , Base curb weight (lbs./kg) 3389/1538 , Steering , Type Power rack-and-pinion , Ratio (overall) Base - 15.2:1; Impala LS - 14.1:1 , Turning Diameter (ft./m) 38.0/11.5 , Brakes , Type 4-wheel disc brakes, Anti-lock brakes with full-function traction control and tire inflation monitoring available , Front disc (mm x mm) 303 x 32, vented , Rear disc (mm x mm) 278 x 11, solid , Engine , 3400 V6 3800 Series II V6 , Type 3.4-liter, 60-degree 3.8-liter, 90-degree OHV OHV , Block Cast iron Cast iron , Cylinder head Aluminum Cast iron , Bore & Stroke , (in.) 3.62 x 3.31 3.80 x 3.40 , (mm) 92.00 x 84.00 92.52 x 86.36 , Redline (rpm) 6000 6000 , Fuel induction Sequential Fuel Injection Sequential Fuel Injection , Horsepower @ rpm 180 @ 5200 200 @ 5200 , Torque (lb.-ft.) @ rpm 205 @ 4000 225 @ 4000 , Exhaust system Stainless steel Stainless steel , Transmission , Type 4T65-E Hydramatic electronically controlled 4-speed automatic transaxle , Chassis , Suspension Type Front Independent MacPherson strut w/separate coil spring , Front Stabilizer Bar Diam. (mm) Base - 32.0; Impala LS - 30.0 , Suspension Type Rear Independent MacPherson strut w/separate coil spring , Rear Stabilizer Bar Diam. (mm) Base - 14.0; Impala LS - 17.2 , Wheels & Tires , Wheel type/size (Base) 16-inch steel with plastic cover , Wheel type/size (LS) 16-inch five-spoke aluminum alloy , Tire size P225/60R16 , Spare size Compact spare