BMW diesel performance valve springs 330d 530d and other (M57 M57N M57N2 engines

Performance valve springs for BMW M57 6 cylinder diesel engines. This set fits:

BMW 325d 330d 335d (E46, E90 years 1999 - 2011 with exceptions)
BMW 525d 530d 535d (E39, E60 years 1999 - 2009)
BMW 635d (E63 years 2004 - 2009)
BMW 730d (E38, E65 years 1999 - 2009)
BMW X3 3.0d and 3.5d (up to 2009)
BMW X5 3.0d and 3.5d (up to 2013 with exceptions)

Valve springs have 35% more valve seat pressure than stock BMW springs. They very effectively solve valve float problem when putting high boost to these engines but do not damage the engine or camshafts. For stock camshafts only.