AST Lowering Springs For BMW 3 4CYL. 10/1999-09/2005, Front 40 , Rear 30 A4 (8K) Why choose CSF’s B‑Tube core

Why choose CSF’s B‑Tube core

Vehicle-specific spring rates developed for the F01 F02 740d xDrive platform

We have installed this setup for many BMW M3 owners and the feedback has been consistently positive

purpose-driven finish

AST Lowering Springs For BMW 3 4CYL. 10/1999-09/2005, Front 40 , Rear 30 A4 (8K) Why choose CSF’s B‑Tube coreThe AST Lowering Springs are engineered specifically for BMW 3 4CYL models produced between 10 1999 and 09 2005. Manufactured using advanced Wafios coiling machines, these springs are cold coiled to ensure superior durability and precision. Designed to lower the vehicles center of gravity, they enhance handling and stability without compromising the ride comfort typically expected from OEM springs. These springs provide a direct replacement for