NA Tuning - Stage 2

Gran Turismo 3: A-Spec NA Tuning - Stage 2 increases high RPM power with high compression pistons, head surface grinding, and cam changes.

NA Tuning - Stage 2 involves using high compression pistons and head surface grinding to further increase the compression ratio. It also includes changing the cams, fitting strengthened valve springs, and grinding the ports. This modification causes a slight reduction in torque at low engine speeds but results in increased power at high engine speeds. The engine management computer is reset to match these new specifications.