The 25th Anniversary, or Anniversario in Italian, was the last and most agressive Countach. The exterior was redesigned by Horacio Pagani and the chassis updated with the help from World Rally Driving Champion Sandro Munari.

This last-of-line model was largely based on the Quattrovalvole 5000S, incorporating its 48-valve engine. Taking the 5000S further, the Anniversary had redesigned aerodynamic ducts for cooling such as the new brake ducts that are incorporated into the rear sills & front dam. The redesigned front and rear kevlar hoods keep to the agressive duct theme as does the optional rear wing. Also included were 2-piece, forged-alloy OZ wheels.

Inside, the car was reworked more than any previous version. Included were new larger seats, door panels and a new steering wheel. New amenities included power windows, better sound deadening and a more powerful air conditioner.

The Anniversary model is part of the stepwise evolution of the Countach since its inception in 1974. It shares the models complex space frame that is central to all the variants. The chassis is centered around a longitudinal V12 with a transmission & clutch positioned ahead of the engine. A drive shaft runs from the transmission, through the crankcase, to the rear differential. Thanks to this unusual layout, the gearshift is mounted directly to the transmission. This positioning makes for a better front to rear weight ratio, removes the need for any gear lever linkages and provides for more precise gear changes. The only downfall to this setup is the added height of the engine to accommodate the drive shaft which gives for a higher center of gravity.

The chassis was upgraded extensively for this version with help from World Rally Champion Sandro Munari. As a result, the Anniversary really is the ultimate Countach since it is more reliable and better handling than the rest.

627 examples were produced from 1988 through to 1990. Cars delivered to the U.S. were fitted with massive rubber bumpers that were necessary to pass 5 mph tests. Once they passed inspection, many of these were fitted with the European-spec units.

type	Series Production Car
production years	1988 – 1990
released at	1988 Monaco GP
built at	Santa’Agata Bolognese, USA
body stylist	Horacio Pagani
production	657
price $	$ 145,000
predeccesor	1986 Lamborghini Countach LP5000 QV
succeccesor	1990 Lamborghini Diablo
engine	60° V12
position	Mid, Longitudinal
aspiration	Natural
valvetrain	DOHC, 4 Valves per Cyl
fuel feed	6 Weber 44 DCNF Carburetors
displacement	5167 cc / 315.3 in³
bore	85.5 mm / 3.37 in
stroke	75.0 mm / 2.95 in
compression	9.5:1
power	339.3 kw / 455.0 bhp @ 7000 rpm
specific output	88.06 bhp per litre
bhp/weight	304.55 bhp per tonne
torque	501.0 nm / 369.5 ft lbs @ 5200 rpm
body / frame	Aluminum Panels w/Kevlar Front & Rear Hood over Steel Spaceframe Chassis
driven wheels	RWD
wheel type	OZ 2-Piece Forged Aluminum Alloy
front tires	225/50 VR-15 Pirelli P Zero
rear tires	345/35 VR-15 Pirelli P Zero
front brakes	Ventilated Discs w/Hydraulic Assist, 4-Piston Calipers
rear brakes	Ventilated Discs w/Hydraulic Assist, 4-Piston Calipers
front wheels	F 38.1 x 21.6 cm / 15.0 x 8.5 in
rear wheels	R 38.1 x 30.5 cm / 15.0 x 12.0 in
steering	Unassisted Rack & Pinion
f suspension	Independent w/Coil Springs, Telescopic Shock Absorbers
r suspension	Independent w/Coil Springs, Telescopic Shock Absorbers
curb weight	1494 kg / 3294 lbs
wheelbase	2473 mm / 97.4 in
front track	1536 mm / 60.5 in
rear track	1606 mm / 63.2 in
length	4240 mm / 166.9 in
width	2017 mm / 79.4 in
height	1070 mm / 42.1 in
transmission	Centrally Mounted ZF 5-Speed Manual
tran clutch	Single dry plate
gear ratios	2.232:1, 1.625:1, 1.085:1, 0.858:1, 0.707:1
final drive	4.09:1
top speed	~305.8 kph / 190.0 mph
0 – 60 mph	~4.8 seconds
0 – 100 mph	~10.0 second