OS Giken PR151-HA Super Lock LSD for Porsche 987 Boxster S/Cayman S 3.4L MT

Vehicle Fitment

• 2006-2012 Porsche 987 Cayman S (3.4L, MT only)
• Porsche 987 Boxster S (2nd generation, 3.4L, MT only)

Fitment Notes

• Manual transmission only - not compatible with Tiptronic/PDK equipped vehicles
• LSD ratio/type: 38/25-456-8-8S Type-E (3-D)

Features

• Patented pressure ring design for smooth, progressive locking
• Spline-through-side-gear design allows up to 2x more friction plates than competitor LSDs (up to 28 plates total)
• Chemically heat-treated, high-grade steel alloy components for maximum durability
• Raw-forged gears for maximum strength
• Precision-machined clutch disks on both sides for minimal warpage
• Single-billet machined LSD case for uniformity
• No break-in period or rebuild required

Specifications

• Type: Clutch-type Limited Slip Differential (Super Lock)
• Lock capability: Fully progressive, 100% lock
• Preload: Low, street-friendly preload with maximum power transfer under load
• Friction plate capacity: Up to 28 plates

Included Components

• 1x OS Giken Super Lock LSD Unit (PR151-HA)

Product Description

The OS Giken PR151-HA Super Lock LSD is the result of over four years of R&D, built specifically for the Porsche 987 Boxster S and Cayman S with the 3.4L manual transmission. Its patented pressure ring and spline-through-side-gear design allow for nearly double the friction plates of competing LSDs, delivering smooth, quiet, fully progressive 100% lock capability rather than an abrupt on/off engagement.

With a low-preload standard spec, the car feels close to an open differential during slow turns and everyday street driving, while still transmitting maximum power to the drive wheels under load. Combined with chemically heat-treated components, raw-forged gears, and a single-billet machined case, it's built for consistent, durable performance without needing a break-in period or rebuild - a serious upgrade for Cayman S and Boxster S owners looking to sharpen corner exit traction on street or track.