The Cusco RS type LSD is designed with low initial torque in order to improve response while reducing clutch plate wear. A chromemoly casing with forged internal components and a unique "through oil system" provide increased durability under severe use. Most LSD's feature multiple ramp angles for tuneability. NOTE: R160 rear LSD case requires modification when fitting with 3.545 and sometimes 3.700 and 3.900 final drives.


Gravel Specification -
CU-180C15 Cusco Front LSD 1.5way 5MT $1250
CU-184C15 Cusco Front LSD 1.5way 6MT $1250

CU-183L2 Cusco Rear LSD 2way R160 $1250
CU-182L2 Cusco Rear LSD 2way R180 $1250

Tarmac Specification -
CU-180C1 Cusco Front LSD 1way 5MT $1250
CU-184C1 Cusco Front LSD 1way 6MT $1250

CU-183L15 Cusco Rear LSD 1.5way R160 $1250
CU-182L15 Cusco Rear LSD 1.5way R180 $1250


RST-1215 Center 20kgf Viscous LSD 5MT $1077


Recommended for rally or drag racing use. Increases resistance torque from 4kgf-m/100rpm (stock) to 20kgf-m/100rpm. Improves response time and reduces heat generation during extreme wheelslip. Will increase understeer in tight cornering.

RST-1902 STi Front 1.5way LSD 6MT $1795
RST-1902T STi '06 Homologation Front LSD 6MT $2011
RST-H190 STi '08 Homologation Front LSD 6MT $2212


Homologated front LSD for use in the 6-speed gearbox. Clutch type 1.5way LSD ('06 homologation is convertable between 1.5way and 1way for optimum gravel or tarmac setting). '08 homologation version converts between 3 different ramp angles.

RST-1902RK STi Front 6MT LSD Overhaul Kit $488
RST-1951RK STi Rear R180 LSD Overhaul Kit $402
RST-1221 STi '02-'05 6MT DCCD Overhaul Kit $1149
RST-1221B STi '06-'08 6MT DCCD Overhaul Kit $1005


Overhaul kits contain clutch discs and additional components. A range of disc thicknesses and cone washer thickness allows for tuning of the initial torque to suit conditions.

RST-1953 STi Pressure Ring Set R180 (STi) $359


Increases the pressure angles of the stock R180 plated LSD (STi models) from 45 degrees to 60 degrees in order to improve throttle sensitivity for competition use. The LSD will operate quicker and more effectively. This is the optimal way to improve the performance of the factory STi rear LSD. Homologated for N11 & N12.


RST-1903 Subaru Helical Front LSD $1131
RST-1903X Helical LSD Install Kit (Req'd up to '05) $95


Recommended for street & track use. This torque biasing limited slip differential provides smooth, consistent, and quiet operation. Sealed maintenance free operation with no special lubrication requirements. Improves traction at the front wheels allowing the driver to get on the power as early as possible out of a corner. Install kit includes stub axle set making it a direct swap for all early Subaru 5MT gearboxes.

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