ISR Performance MX5 Miata Short Shifter 89-98ISR Performance Short Shifter MX5 Miata 89 98 The ISR Short Shifter reduces movement by ~37. 3% for faster shifting whilst reducing shifter slop, and is a Direct Bolt In. Whats in the box: 1x Short Shifter 1x Hardware Kit ** ** Legal only for use in competition vehicles which may never be registered, licensed, and or used on public streets or highways; and also for use in other exempted vehicles.