Helical Limited Slip Differential for use with an  Subaru BRZ & Toyota GT86. 
 
The advantages of the Blackline Helical LSD include:
 
Equal rotational speed to both wheels
Torque distributed according to traction
Minimal service requirements - no clutches
Quick reaction compared to viscous LSD setups
Gentle and progressive engagement, low noise
Easily controlled power on take-off and drifting
Gears and body manufactured from 8620 alloy steel
Direct replacement into a stock differential
Top quality at a competitive price