Lexus IS Differential - Cusco - Type RS 2-Way(1&2) B-Size - `09-`19. This clutch-type limited slip differential is built to improve traction and stability for demanding street and track driving.

Cusco’s Type RS design uses spring-loaded pressure rings to keep initial torque low, promoting smoother engagement and predictable lock-up. The 2-way configuration provides locking effect under both acceleration and deceleration, helping maintain control during corner entry and exit. This B-Size unit is designed for 09-19 Lexus IS250/350 and is also listed to fit 10-19 GS350/450h and 15-18 RC200t/300/350 where applicable. It’s a proven choice for enthusiasts seeking consistent grip without harsh behavior in daily use.

Features

• Type RS clutch LSD for smooth, responsive engagement
• 2-way locking under acceleration and deceleration
• B-Size specification for correct carrier fitment
• Listed compatibility: 09-19 IS250/350; 10-19 GS350/450h; 15-18 RC200t/300/350
• Designed for balanced street and track performance

Have questions about fitment or setup? Call us and talk to a specialist at our Austin, Texas or Los Angeles, California area locations—we offer installation and customization services on-site. TX: 512-982-9393, CA: 562-981-6800.

Buying multiple items? Contact us for possible shipping discounts. We install on premises at both locations.

CA Residents: WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov