Sweet!!!
A short piece from the page,
The FWD SR20DE full dog box is the thing to have when you have turboed the N/A SR20DE or have installed a U12 Bluebird/U13 Bluebird/GTi-R turbo engine into your FWD Pulsar, Sentra, SE-R, NX Coupe (or anything with a FWD SR20DE). The dog gearset is made from EN36A case hardening alloy steel which is hardened and tempered through a special heat treatment process after the manufacturing stage. This is a dog (1st to 4th gear) gearset with straight cut gears and will handle all the power your engine can supply. The dog gears are rated at around 600hp.