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AST springs deliver a consistent and dependable enhancement aligned with professional automotive expectations
Less prone to warping & cracking
- Non-M 3 Series | F30/F31/F34/F35
Improve reliability for the road and track
this mid pipe is capable of supporting serious power levels while remaining fully usable for daily driving and fast road use
ARP Head Stud Kit - BMW S14 F21 M135I AST springs deliver a consistentStrengthen the bottom end of your BMW S14 engine with the ARP Head Stud Kit BMW S14, delivering far greater clamping force and sealing than the factory fasteners. Engineered by ARP (Automotive Racing Products), this head stud kit is built to the standards demanded by high performance and motorsport BMW builds. Key Features Designed for BMW S14 engine Significantly increased clamping force over OEM fasteners Improved head gasket sealing and cylinder
