In mid-2002, the GTS trim was introduced for the 2003 model year. This vehicle included an engine with a 10:1 compression ratio, revised camshaft profile, and an improved Mitsubishi Variable Induction Management (MVIM) air intake system that gave the car an extra 10 hp (7.5 kW) and a slightly improved power curve. The 2003–2005 GTS coupe, GTS Spyder and GT Spyder shared the new engine while the GT coupe retained the 200 hp (149 kW) powertrain.
With the introduction of the 2003 GTS model, the Eclipse saw minor changes including a redesigned front bumper with slotted fog lights, as well as a recoloring of the taillights. On the interior, the gauge face changed, and the door panels were also redesigned. Newly designed five-spoke chrome wheels were offered with the GT and GTS trims.
The Mitsubishi Eclipse is exclusive to the DS version of the game. The PSP version of the game has the Mitsubishi Eclipse GTS instead.