DINAN – Supplemental Ride Quality & Handling Kit – BMW 340i / 428i / 430i / 435i / 440i (14–20)

Unlock the full potential of your Dinan Performance Spring Set with the Dinan Supplemental Ride Quality & Handling Kit. Designed to complement lowered suspension setups, this kit ensures optimal ride comfort, suspension travel, and cornering stability—enhancing both performance and daily drivability.

The kit includes progressive-rate bump stops that maximize suspension compression travel, preventing harsh bottoming-out that can occur after lowering. By allowing the springs to operate through their full range of motion, the system maintains balanced damping and superior handling composure. Each bump stop is carefully tuned to match Dinan’s specific spring rates, delivering a more controlled, compliant, and confidence-inspiring ride.

Whether for spirited street driving or track use, this upgrade ensures your suspension setup feels refined and predictable—transforming your lowered BMW into a truly dynamic performer.

Features & Benefits:

• Includes 4 precision-tuned progressive bump stops

• Maximizes suspension travel for improved ride comfort

• Prevents bottoming-out on lowered vehicles

• Enhances mechanical grip and cornering performance

• OE-quality materials ensure durability and consistent behavior

• Optimized for use with Dinan Performance Springs
  

Fitment Table: