The BMW X5 4.8is is the high-performance flagship of the first-generation E53 X5, powered by a naturally aspirated 4.8L M62 V8 producing 360 hp and 369 lb-ft of torque. Its performance hardware includes xDrive all-wheel drive, a 5-speed Steptronic automatic transmission, sport-tuned suspension, larger brakes, 20-inch staggered wheels, and a lowered ride height, giving the E53 a more aggressive, road-focused setup than the standard X5.

The 4.8is is significant because it established the BMW performance SUV formula before the X5 M, combining a high-output V8 with BMW's road-focused chassis engineering. With its naturally aspirated power delivery, wide stance, hydraulic steering, and relatively analog driving character, the E53 X5 4.8is remains one of the most distinctive early luxury sport SUVs and an important precursor to today's high-performance X5 lineup.