The stock differential of the non-M model E46 only puts power to one wheel -- this just won't cut it! Upgrading to a limited slip differential means power to BOTH wheels, for better lauch, acceleration, and track handling. Fits non-M E46 models, including 1999-2000 323i, 323Ci, 328i & 328Ci and 2001-2005 325i, 325ci, 330i & 330ci (not for 3.07, 2.93 or any ratios lower than 3.15). We're excited to be carrying the OS Giken LSD unit in our performance catalog, as we've used their products on our own Championship winning E46 race cars.

OS Giken incorporated revolutionary new ideas when developing the their own limited slip diff, utilizing their accumulated racing knowledge and experience and over 4 years of development. Their design uses an unprecedented number of friction plates (up to 28 total!) for better locking force, better engagement/disengagement, and less generated heat. The end result of their efforts is the OS Giken's OS Super Lock LSD which offers incredible durability and reliability on street and track driven BMWs. The use of highest quality materials, precise machining, forged gears and sound engineering makes this LSD durable and reliable enough for road racing performance (which we can personally vouch for!). This is such a great design, in that it can be used in any situation -- whether it's for a street car, or a 100% Professional race car. Zero break-in required but oil should be changed after 1800 miles with regular fluid service after that. Super smooth and quiet engagement, and 100% progressive locking capability. Professional installation is recommended (requires minor trimming of differential case).

This Limited Slip Differential Unit fits the following BMWs:
1999-2000 E46 3 Series 323i, 323Ci, 328i & 328Ci
2001-2005 E46 3 Series 325i, 325Ci, 330i & 330Ci
2006-2006 E46 3 Series 325Ci & 330Ci
2006-2011 E90 3 Series 325i 330i - Sedan - Automatic Transmission
1997-2003 E39 5 Series 525i 528i 530i - Automatic Transmission
2004-2005 E60 5 Series 525i - Automatic Transmission
2004-2005 E85 Z4 Z4 3.0i - Automatic Transmission