The 2004 model S2000 underwent several significant changes. Production moved to Suzuka. The new model introduced 17 in (43 cm) wheels and Bridgestone RE-050 tyres along with a retuned suspension to reduce oversteer. The spring rates and shock absorber damping were altered and the suspension geometry was modified to improve stability by reducing toe-in changes under cornering loads. The subframe also received a revision in design to achieve high rigidity. In the gearbox the brass synchronizers were replaced with carbon fibre. In addition, cosmetic changes were made to the exterior with new front and rear bumpers, revised headlight assemblies, new LED tail-lights, and oval-tipped exhaust pipes. Although all the cosmetic, suspension and most drivetrain upgrades were included on the Japanese, Australian and European models, they retained the 2.0-litre F20C engines and remained designated as AP1 (facelift) models.
For the North American market, the updates also included the introduction of a larger version of the F20C (with a designation of F22C1); this larger engine gave the new model a chassis designation of AP2. The engine's stroke was lengthened, increasing its displacement to 2,157 cc (2.2 L; 131.6 cu in). At the same time, the redline and fuel cutoff were reduced from 8,800 rpm and 9,000 rpm to 8,000 rpm and 8,200 rpm respectively, mandated by the longer travel of the pistons. Peak torque increased by 6% to 220 N⋅m (162 lbf⋅ft) at 6,800 rpm while power output remained unchanged at 177 kW (237 hp) achieved at a lower 7,800 rpm. In conjunction with the introduction of the F22C1, Honda also changed the transmission gear ratios by shortening the first five gears and lengthening the sixth. People used to call 2004-2005 USDM S2000 ap1.5 due to it is F22C1 with Wire Throttle Body.
In 2006, the F22C1 was also introduced to the Japanese market, with a power output of 178 kW (242 PS; 239 hp) and 221 N⋅m (163 lbf⋅ft). The F20C continued in all other markets. The 2006 model introduced a drive by wire throttle, an electronic stability control system, new wheels, and one new exterior color, Laguna Blue Pearl. Interior changes included revised seats and additional stereo speakers integrated into the headrests.
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