I assume you're asking about the Lancer EVOLUTION. (The Evo is a type of Lancer, but 100x better, in case you didn't know that they were similar cars.) This information was sourced from
www.autozine.org and my memory (mostly applies to Evo VIII and IX):
Evo (1992): Lancer with 250 hp and 228 lb.-ft, AWD, aluminum hood
Evo II (late 1993): 260 hp, slight height adjustment
Evo III (early 1995): 270 hp, larger intercooler, new aerodynamic kit (included big front bumper and bi-plane rear wing)
Evo IV (mid 1996): redesigned (based on new Lancer), 280 hp (already at Japan's domestic regulation) and 261 lb.-ft, helical mechanical rear LSD used, but AYC (Active Yaw Control, basically a computer-controlled rear LSD) was an option
Evo V (early 1998): 280 hp and 275 lb.-ft, wider front and rear tracks (distance between left and right wheels), bigger wheels and tires, Brembo brakes (same manufacturer who makes brakes for Ferraris and other race cars), inverted dampers, new turbo, updated AYC
Evo VI (early 1999): roughly same hp and torque but available earlier, improved aerodynamics
Evo VII (late 2000): redesigned, 280 hp (actually over 300 but advertised at 280 due to regulations), stiffer structure, aluminum front fenders, magnesium cam cover, longer, wider, ACD (Active Center Differential, computer-controlled LSD that is one of the most advanced, especially at the time)
Evo VIII (late 2002): slightly redesigned body (mostly the front end, since it was altered to incorporate a front crash beam that is needed for U.S. regulations since they finally decided to bring the car to the U.S.), 280 hp (actually 310 hp) and 289 lb.-ft, 6-speed gearbox, carbon fiber rear wing, Super AYC
U.S. Evo VIII (early 2003): 271 hp and 273 lb.-ft (detuning was necessary in order to comply with U.S. emissions regulations), viscous center LSD instead of ACD, mechanical rear LSD instead of Super AYC (used in order to lower price of car and to increase the size of the fuel tank since the equipment for Super AYC is quite large)
U.S. Evo VIII RS (2004): same as U.S. Evo VIII, but with a helical front LSD, aluminum roof, and without A/C, power accessories, radio, etc.
U.S. Evo VIII (2005): ACD replaces viscous center LSD in all models, updated engine in all models with 276 hp and 286 lb.-ft, 5500 rpm launch limit (activated only when car isn't moving), MR version available with 6-speed, aluminum roof (like the RS), Bilstein shocks (smoother ride but identical performance), lightweight BBS wheels, vortex generator
U.S. Evo IX (late 2005): slightly redesigned front end, MIVEC added (Mitsubishi's version of variable valve timing), 286 hp (actually over 300 hp) and 289 lb.-ft, smoked headlights and taillights, updated wheels