The 2004 model year incorporated several revisions to the S2000 and was given the chassis designation of AP2. The 2004 model introduced newly designed 17 in (43 cm) wheels and Bridgestone RE-050 tires along with a retuned suspension to reduce oversteer. The spring rates and shock absorber damping were altered and the suspension geometry modified to improve stability by reducing toe-in changes under cornering loads. In the gearbox the brasssynchronizers were replaced with carbon fiber. 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 exhausts.
Since the engine used on the new body was still the F20C, this model has been affectionately called AP1.5, as the AP2 was reserved for the newer F22C-equipped version.
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