HONDA K-series Long 6th Gear kit. This is an excellent mod for those who motorway commute. Reports from people who have installed this note an increase of 10% fuel economy. It comes with main shaft and counter shaft gears, synchro, needle bearing and collar. As with all genuine Honda parts expect perfect fit and performance every time. The below table shows the rev differences at different speeds when installed into a Integra DC5 gearbox. 

6th Ratio is 0.658