If you are unsure of which generation your engine is

Ferrea Valve Spring Kit KT4026 for the BMW N54 are engineered to overcome the most common performance-limiting issues: valve binding

Note: These connecting rods are symmetrical and do not require a specific front-to-back installation orientation

These high-performance pistons are an excellent investment for enthusiasts

Supertech springs provide improved spring rates

ARP Head Stud Kit, BMW M10 F87 If you are unsure ofThe ARP head stud kit for the BMW M10 B18 and B20 engine (1. 5L & 2. 0L) 4 cylinder, is designed to provide improved clamping force for the cylinder head to the engine block. The kit includes high strength, heat treated studs, premium grade parallel ground washers, and 12 point nuts. The ARP head studs 201 4601 are made from premium grade 8740 chromoly steel, which is stronger and more durable than the factory bolts. The studs are heat treated to