The 2004 model S2000 underwent several significant changes. Production moved to Suzuka. The new model introduced 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 models.