Specifications
Learn the technical details of the M.
  M35 M35x AWD M45 M45x AWD
Engine 3.5-liter (3,498cc) 24-valve V6, aluminum-alloy block and heads. Low-friction molybdenum-coated pistons.[?] 4.5-liter (4,494cc) 32-valve V8, aluminum-alloy block and heads. Low-friction molybdenum-coated pistons.
Valvetrain Double overhead cam (DOHC), 4 valves per cylinder with microfinished camshafts. Continuously Variable Valve Timing Control System (CVTCS) optimizes opening of intake valves. Double overhead cam (DOHC), 4 valves per cylinder with microfinished camshafts. Titanium intake and exhaust valves. Continuously Variable Valve Timing Control System (CVTCS) optimizes opening of intake valves.
Intake System High-flow tuned induction system Variable-flow induction system optimizes airflow for low- and high-speed operation.
Horsepower 275 hp @ 6,200 rpm 325 hp @ 6,400 rpm
Torque 268 lb-ft @ 4,800 rpm 336 lb-ft @ 4,000 rpm
Transmission [?]5-speed automatic transmission and manual shift mode with Downshift Rev Matching
Drive Wheels Rear-wheel drive Intelligent All-Wheel Drive (AWD) Rear-wheel drive Intelligent All-Wheel Drive (AWD)
  M35 M35x AWD M45 M45x AWD
Steering
Type Engine-speed-sensitive variable-assist power rack-and-pinion
Turning diameter 36.7 feet 36.1 feet 36.7 feet 36.1 feet
Suspension
Front Independent, double-wishbone with coil springs over shock absorbers, stabilizer bar.[?]
Rear Independent, multi-link with coil springs over shock absorbers, stabilizer bar.[?]
Sport Package Rear Active Steer and sport-tuned suspension   Rear Active Steer and sport-tuned suspension  
Brakes
Front 12.6 x 1.1-inch ventilated discs
Rear 12.1 x 0.6-inch ventilated discs
Wheels and Tires
Wheels Split 5-spoke, 18 x 8.0-inch aluminum-alloy
Sport Package Wheels Split 5-spoke, 19 x 8.5-inch aluminum-alloy   Split 5-spoke, 19 x 8.5-inch aluminum-alloy  
Tires 245/45R18 V-rated all-season performance
Sport Package Tires 245/40R19 W-rated summer performance   245/40R19 W-rated summer performance  
Spare Tire Temporary use, 145/80D17
  M35 M35x AWD M45 M45x AWD
Exterior
Coefficient of drag 0.28
Overall length 194.1 inches
Wheelbase 114.2 inches
Overall width 71.1 inches
Track width (front/rear) 60.2 inches/60.8 inches 60.4 inches/60.4 inches 60.2 inches/60.8 inches 60.4 inches/60.4 inches
Overall height 59.4 inches 60.0 inches 59.4 inches 60.0 inches
Interior
Headroom 39.6 inches (front)/37.8 inches (rear)/37.1 inches (rear with Premium Package)
Legroom 44.2 inches (front)/37.3 inches (rear)/36.2 inches (rear with Premium Package)
Shoulder room 58.2 inches (front)/56.9 inches (rear)/56.7 inches (rear with Premium Package)
Hip room 55.1 inches (front)/53.9 inches (rear)
Capacities and Weights
Curb weight 3,876 lbs 4,041 lbs 3,990 lbs 4,176 lbs
Weight distribution 53/47 percent (front/rear) 54/46 percent (front/rear) 54/46 percent (front/rear) 55/45 percent (front/rear)
Passenger volume 105.2 cubic feet
Cargo volume 14.9 cubic feet
Fuel capacity 20.0 gallons
  M35 M35x AWD M45 M45x AWD
City/Highway 16 mpg/23 mpg 16 mpg/22 mpg 16 mpg/21 mpg 14 mpg/20 mpg
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[1] For model year 2008, the EPA has revised the way the estimated fuel economy rating is determined. For example, the combined fuel economy range for the comparable class of vehicle in 2007 was 9?32 mpg, but under EPA's revised fuel economy test procedures, the comparable class combined range for 2008 may be 10?30 mpg according to EPA's preliminary estimates.
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275-hp 3.5-liter 24-valve V6 Engine
One way to judge an engine's potential is to take a look at its lineage. The 3.5-liter V6 supplying power to the M35 is the famed VQ — the engine that Ward's placed on their list of "10 Best Engines" 14 years in a row.[1]

[1] January 2008, Wardsauto.com.
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5-speed Automatic Transmission and Manual Shift Mode with Downshift Rev Matching
Until it is harnessed, engine power is purely potential. Channeling the considerable power generated by both the V6 and V8 engines is a 5-speed automatic. A sophisticated learning algorithm adapts to your individual driving style and shifts to optimize engine performance. Select manual shift mode and take complete control of the five precisely matched gears. When downshifting, the engine automatically adjusts engine speed output to smooth out shifts.
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Independent Front and Rear Suspension with Aluminum-alloy Components
A double wishbone front and multi-link rear suspension gives the Infiniti M exquisite ride quality on the open road, and firm, taut handling in corners. Springs, shocks, and stabilizer bars are tuned for crisp performance.

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