Honda K Series Close Ratio Pro-Spec 1

The Honda K Series Close Ratio Pro-Spec 1 is a drop-in replacement kit designed for 2007+ FN2-FD2 Honda Civic and Si. It provides the perfect ratio for full race K-20 or K-24 applications, such as road and gravel rallying, sprints, hill climbs, and road racing.

Works extremely well with a 5.06 (OEM) or 5.08, 5.46, 5.84 GEAR-X Final Drive. Ratios:

1st – 2.313 2nd -1.650 3rd -1.304 4th – 1.080 5th – 0.958 6th – 0.851