Blackline ATB Helical LSD differential is for the Renault Clio 197 / 200 (TL4) 

A LSD will improve your straight line traction and also aid handling by providing consistent traction. This torsen type differential provides smooth transition in torque without the grabbiness of a plate type LSD. 

These diffs are produced by one of the largest corporations in China to OEM specs.
The diff operation is identical to the Torsen parallel gear system, similar to Quaife. The bodies are drop forged for increased strength and less cost because of reduced machining time. Offers a great value alternative to the ubiquitous Quaife ATB.

The Blackline ATB Limited Slip Differential

Once installed, drivers will notice an immediate difference, as the limited slip differential automatically biases the torque across the axle to the wheel with the most grip. Unwanted wheelspin and slip are greatly reduced, resulting in less understeer on front or four wheel drive machines.

On front wheel drive cars the limited slip differential also delivers significant performance benefits during heavy braking. In this situation the differential’s inherent torque transfer characteristics work in reverse to transfer torque away from the locking wheel. This enhances deceleration, delaying the intrusion of electronic ABS systems and allowing drivers to brake later and deeper with the limited slip differential than is possible with a standard ‘open’ differential unit.

Add these benefits together and it’s hardly surprising that in outright performance terms the differential can make a remarkable difference compared to an ‘open’ differential.