Front Bump Stop, Rein - E46 Sport/M Sport, E85/E86 standard suspension

Specific Fitment Info:
1999-2006 E46 323i/325i/328i/330i (except Xi) with the factory Sport, M Sport, or any lowered suspension*
2003-2008 E85/E86 Z4 2.5i/3.0i/3.0si with standard suspension

The bump stop is a stiff foam block that slides over the shaft of your front strut or rear shock. Under full compression the bump stop prevents the shock from completely bottoming-out, causing damage to the shock or to the chassis. In other scenarios the bump stop can actually play an active role in the handling and stiffness of the car. Because of their placement, bump stops are subjected to debris, moisture, and heat and this can degrade its performance or cause it to fail completely. BMW insists on new bump stops any time a new shock is installed on a car**.

* - this bump stop is shorter and stiffer and great for mildly lowered cars. For extreme lowering, see part #31336778545 which is even shorter.

** - many aftermarket performance shocks like Bilstein or KONI will come with their own bump stops and new ones are not required. This does not apply to any Bilstein or KONI or other brand marked as "OEM".

This is a bump stop manufactured by Rein (CRP) Automotive - an original supplier to BMW for many mounts and bushings. As an OEM it meets all of BMW's original design, fitment, and performance requirements and is TUV approved. OEM parts are the best alternative to more expensive Original BMW parts because they are virtually identical without the inflated price tag. This part has a two year warranty.

BMW Fitments:

3 Series
E46 (99-05) > 323Ci
E46 (99-05) > 323i
E46 (99-05) > 325Ci
E46 (99-05) > 325i
E46 (99-05) > 328Ci
E46 (99-05) > 328i
E46 (99-05) > 330Ci
E46 (99-05) > 330i
Z Series
E85 / E86 Z4 (03-08) > Z4 2.5i M54
E85 / E86 Z4 (03-08) > Z4 3.0i M54
E85 / E86 Z4 (03-08) > Z4 3.0i N52
E85 / E86 Z4 (03-08) > Z4 3.0si N52