ST X Coilovers 2014-20 BMW 3 & 4 Series (428i Convertible)

Free ground shipping. 

This is a special order kit. Delivery time can be 2-4 weeks.

Fits 428i convertible. Fits most 3 & 4 series models.

See fitment guide below for all applications, special notes, and exact front and rear lowering ranges. 

Looking for a good set of coilovers but don't want to spend a fortune?

ST suspension, which is engineered by KW to their satisfaction, offers this great entry level option.

All ST suspension products are assembled in KW's shops in Germany. 

ST height adjustable coilover kits are precision engineered and road tested to the highest standards of the German TUV.

Sport dampers that are valved per vehicle, and slightly stiffer progressive rate coil springs, will transform handling, cornering, and feedback.

The finely threaded shock bodies allow you to precisely adjust ride height without compromising safety, comfort, or performance.

Set the stance exactly the way you like.

Heavily coated with the best corrosion resistant materials, these galvanized steel and powder coated coilovers will provide a lifetime of trouble free performance in any conditions.

• Height-adjustable
• Composite spring plate
• Dust protection and bump stop

Installation instructions

Product images are example only and may not be the actual kit for your car.

The best coilovers for BMW 428i at MGC. 

Fitment Guide:

• 2014-2018 BMW 320i Base L4.1997cc

  2014: Lowering Rate: F: 1.2-2.2" / R: 0.6-1.6" 42: Wheel spacers may be necessary if using stock wheels and tires. 06: All vehicles equipped with the EDC system (electronic damper control) are NOT APPLICABLE
  2015: Lowering Rate: F: 1.2-2.2" / R: 0.6-1.6" 42: Wheel spacers may be necessary if using stock wheels and tires. 06: All vehicles equipped with the EDC system (electronic damper control) are NOT APPLICABLE
  2016: Lowering Rate: F: 1.2-2.2" / R: 0.6-1.6" 42: Wheel spacers may be necessary if using stock wheels and tires. 06: All vehicles equipped with the EDC system (electronic damper control) are NOT APPLICABLE
  2017: Lowering Rate: F: 1.2-2.2" / R: 0.6-1.6" 42: Wheel spacers may be necessary if using stock wheels and tires. 06: All vehicles equipped with the EDC system (electronic damper control) are NOT APPLICABLE
  2018: Lowering Rate: F: 1.2-2.2" / R: 0.6-1.6" 42: Wheel spacers may be necessary if using stock wheels and tires. 06: All vehicles equipped with the EDC system (electronic damper control) are NOT APPLICABLE

• 2014-2018 BMW 328d Base L4.1997cc

  2014: Lowering Rate: F: 1.2-2.2" / R: 0.6-1.6" 42: Wheel spacers may be necessary if using stock wheels and tires. 06: All vehicles equipped with the EDC system (electronic damper control) are NOT APPLICABLE
  2015: Lowering Rate: F: 1.2-2.2" / R: 0.6-1.6" 42: Wheel spacers may be necessary if using stock wheels and tires. 06: All vehicles equipped with the EDC system (electronic damper control) are NOT APPLICABLE
  2016: Lowering Rate: F: 1.2-2.2" / R: 0.6-1.6" 42: Wheel spacers may be necessary if using stock wheels and tires. 06: All vehicles equipped with the EDC system (electronic damper control) are NOT APPLICABLE
  2017: Lowering Rate: F: 1.2-2.2" / R: 0.6-1.6" 42: Wheel spacers may be necessary if using stock wheels and tires. 06: All vehicles equipped with the EDC system (electronic damper control) are NOT APPLICABLE
  2018: Lowering Rate: F: 1.2-2.2" / R: 0.6-1.6" 42: Wheel spacers may be necessary if using stock wheels and tires. 06: All vehicles equipped with the EDC system (electronic damper control) are NOT APPLICABLE

• 2018 BMW 328d xDrive Base L4.1997cc

  2018: Lowering Rate: F: 1.2-2.2" / R: 0.6-1.6" 42: Wheel spacers may be necessary if using stock wheels and tires. 06: All vehicles equipped with the EDC system (electronic damper control) are NOT APPLICABLE

• 2014-2016 BMW 328i Base L4.1997cc

  2014: Lowering Rate: F: 1.2-2.2" / R: 0.6-1.6" 42: Wheel spacers may be necessary if using stock wheels and tires. 06: All vehicles equipped with the EDC system (electronic damper control) are NOT APPLICABLE
  2015: Lowering Rate: F: 1.2-2.2" / R: 0.6-1.6" 42: Wheel spacers may be necessary if using stock wheels and tires. 06: All vehicles equipped with the EDC system (electronic damper control) are NOT APPLICABLE
  2016: Lowering Rate: F: 1.2-2.2" / R: 0.6-1.6" 42: Wheel spacers may be necessary if using stock wheels and tires. 06: All vehicles equipped with the EDC system (electronic damper control) are NOT APPLICABLE

• 2016 BMW 330e Base L4.1998cc

  2016: Lowering Rate: F: 1.2-2.2" / R: 0.6-1.6" 42: Wheel spacers may be necessary if using stock wheels and tires. 06: All vehicles equipped with the EDC system (electronic damper control) are NOT APPLICABLE
  2018: Lowering Rate: F: 1.2-2.2" / R: 0.6-1.6" 42: Wheel spacers may be necessary if using stock wheels and tires. 06: All vehicles equipped with the EDC system (electronic damper control) are NOT APPLICABLE

• 2018 BMW 330e Base L4.1998cc

  2016: Lowering Rate: F: 1.2-2.2" / R: 0.6-1.6" 42: Wheel spacers may be necessary if using stock wheels and tires. 06: All vehicles equipped with the EDC system (electronic damper control) are NOT APPLICABLE
  2018: Lowering Rate: F: 1.2-2.2" / R: 0.6-1.6" 42: Wheel spacers may be necessary if using stock wheels and tires. 06: All vehicles equipped with the EDC system (electronic damper control) are NOT APPLICABLE

• 2017 BMW 330e iPerformance L4.1998cc

  2017: Lowering Rate: F: 1.2-2.2" / R: 0.6-1.6" 42: Wheel spacers may be necessary if using stock wheels and tires. 06: All vehicles equipped with the EDC system (electronic damper control) are NOT APPLICABLE

• 2017-2018 BMW 330i Base L4.1998cc

  2017: Lowering Rate: F: 1.2-2.2" / R: 0.6-1.6" 42: Wheel spacers may be necessary if using stock wheels and tires. 06: All vehicles equipped with the EDC system (electronic damper control) are NOT APPLICABLE
  2018: Lowering Rate: F: 1.2-2.2" / R: 0.6-1.6" 42: Wheel spacers may be necessary if using stock wheels and tires. 06: All vehicles equipped with the EDC system (electronic damper control) are NOT APPLICABLE

• 2014-2015 BMW 335i Base L6.2979cc

  2014: Lowering Rate: F: 1.2-2.2" / R: 0.6-1.6" 42: Wheel spacers may be necessary if using stock wheels and tires. 06: All vehicles equipped with the EDC system (electronic damper control) are NOT APPLICABLE
  2015: Lowering Rate: F: 1.2-2.2" / R: 0.6-1.6" 42: Wheel spacers may be necessary if using stock wheels and tires. 06: All vehicles equipped with the EDC system (electronic damper control) are NOT APPLICABLE

• 2016-2018 BMW 340i Base L6.2998cc

  2016: Lowering Rate: F: 1.2-2.2" / R: 0.6-1.6" 42: Wheel spacers may be necessary if using stock wheels and tires. 06: All vehicles equipped with the EDC system (electronic damper control) are NOT APPLICABLE
  2017: Lowering Rate: F: 1.2-2.2" / R: 0.6-1.6" 42: Wheel spacers may be necessary if using stock wheels and tires. 06: All vehicles equipped with the EDC system (electronic damper control) are NOT APPLICABLE
  2018: Lowering Rate: F: 1.2-2.2" / R: 0.6-1.6" 42: Wheel spacers may be necessary if using stock wheels and tires. 06: All vehicles equipped with the EDC system (electronic damper control) are NOT APPLICABLE

• 2014-2016 BMW 428i Base L4.1997cc

  2014: Lowering Rate: F: 1.6-2.5" / R: 1.6-2.5" 42: Wheel spacers may be necessary if using stock wheels and tires. 06: All vehicles equipped with the EDC system (electronic damper control) are NOT APPLICABLE
  2015: Lowering Rate: F: 1.6-2.5" / R: 1.6-2.5" 42: Wheel spacers may be necessary if using stock wheels and tires. 06: All vehicles equipped with the EDC system (electronic damper control) are NOT APPLICABLE
  2016: Lowering Rate: F: 1.6-2.5" / R: 1.6-2.5" 42: Wheel spacers may be necessary if using stock wheels and tires. 06: All vehicles equipped with the EDC system (electronic damper control) are NOT APPLICABLE

• 2015-2016 BMW 428i Gran Coupe Base L4.1997cc

  2015: Lowering Rate: F: 1.6-2.5" / R: 1.6-2.5" 42: Wheel spacers may be necessary if using stock wheels and tires. 06: All vehicles equipped with the EDC system (electronic damper control) are NOT APPLICABLE
  2016: Lowering Rate: F: 1.6-2.5" / R: 1.6-2.5" 42: Wheel spacers may be necessary if using stock wheels and tires. 06: All vehicles equipped with the EDC system (electronic damper control) are NOT APPLICABLE

• 2017-2020 BMW 430i Base L4.1998cc

  2017: Lowering Rate: F: 1.6-2.5" / R: 1.6-2.5" 42: Wheel spacers may be necessary if using stock wheels and tires. 06: All vehicles equipped with the EDC system (electronic damper control) are NOT APPLICABLE
  2018: Lowering Rate: F: 1.6-2.5" / R: 1.6-2.5" 42: Wheel spacers may be necessary if using stock wheels and tires. 06: All vehicles equipped with the EDC system (electronic damper control) are NOT APPLICABLE
  2019: Lowering Rate: F: 1.6-2.5" / R: 1.6-2.5" 42: Wheel spacers may be necessary if using stock wheels and tires. 06: All vehicles equipped with the EDC system (electronic damper control) are NOT APPLICABLE
  2020: Lowering Rate: F: 1.6-2.5" / R: 1.6-2.5" 42: Wheel spacers may be necessary if using stock wheels and tires. 06: All vehicles equipped with the EDC system (electronic damper control) are NOT APPLICABLE

• 2017-2020 BMW 430i Gran Coupe Base L4.1998cc

  2017: Lowering Rate: F: 1.6-2.5" / R: 1.6-2.5" 42: Wheel spacers may be necessary if using stock wheels and tires. 06: All vehicles equipped with the EDC system (electronic damper control) are NOT APPLICABLE
  2018: Lowering Rate: F: 1.6-2.5" / R: 1.6-2.5" 42: Wheel spacers may be necessary if using stock wheels and tires. 06: All vehicles equipped with the EDC system (electronic damper control) are NOT APPLICABLE
  2019: Lowering Rate: F: 1.6-2.5" / R: 1.6-2.5" 42: Wheel spacers may be necessary if using stock wheels and tires. 06: All vehicles equipped with the EDC system (electronic damper control) are NOT APPLICABLE
  2020: Lowering Rate: F: 1.6-2.5" / R: 1.6-2.5" 42: Wheel spacers may be necessary if using stock wheels and tires. 06: All vehicles equipped with the EDC system (electronic damper control) are NOT APPLICABLE

• 2014-2016 BMW 435i Base L6.2979cc

  2014: Lowering Rate: F: 1.6-2.5" / R: 1.6-2.5" 42: Wheel spacers may be necessary if using stock wheels and tires. 06: All vehicles equipped with the EDC system (electronic damper control) are NOT APPLICABLE
  2015: Lowering Rate: F: 1.6-2.5" / R: 1.6-2.5" 42: Wheel spacers may be necessary if using stock wheels and tires. 06: All vehicles equipped with the EDC system (electronic damper control) are NOT APPLICABLE
  2016: Lowering Rate: F: 1.6-2.5" / R: 1.6-2.5" 42: Wheel spacers may be necessary if using stock wheels and tires. 06: All vehicles equipped with the EDC system (electronic damper control) are NOT APPLICABLE

• 2015-2016 BMW 435i Gran Coupe Base L6.2979cc

  2015: Lowering Rate: F: 1.6-2.5" / R: 1.6-2.5" 42: Wheel spacers may be necessary if using stock wheels and tires. 06: All vehicles equipped with the EDC system (electronic damper control) are NOT APPLICABLE
  2016: Lowering Rate: F: 1.6-2.5" / R: 1.6-2.5" 42: Wheel spacers may be necessary if using stock wheels and tires. 06: All vehicles equipped with the EDC system (electronic damper control) are NOT APPLICABLE

• 2017-2020 BMW 440i Base L6.2998cc

  2017: Lowering Rate: F: 1.6-2.5" / R: 1.6-2.5" 42: Wheel spacers may be necessary if using stock wheels and tires. 06: All vehicles equipped with the EDC system (electronic damper control) are NOT APPLICABLE
  2018: Lowering Rate: F: 1.6-2.5" / R: 1.6-2.5" 42: Wheel spacers may be necessary if using stock wheels and tires. 06: All vehicles equipped with the EDC system (electronic damper control) are NOT APPLICABLE
  2019: Lowering Rate: F: 1.6-2.5" / R: 1.6-2.5" 42: Wheel spacers may be necessary if using stock wheels and tires. 06: All vehicles equipped with the EDC system (electronic damper control) are NOT APPLICABLE
  2020: Lowering Rate: F: 1.6-2.5" / R: 1.6-2.5" 42: Wheel spacers may be necessary if using stock wheels and tires. 06: All vehicles equipped with the EDC system (electronic damper control) are NOT APPLICABLE

• 2017-2020 BMW 440i Gran Coupe Base L6.2998cc

  2017: Lowering Rate: F: 1.6-2.5" / R: 1.6-2.5" 42: Wheel spacers may be necessary if using stock wheels and tires. 06: All vehicles equipped with the EDC system (electronic damper control) are NOT APPLICABLE
  2018: Lowering Rate: F: 1.6-2.5" / R: 1.6-2.5" 42: Wheel spacers may be necessary if using stock wheels and tires. 06: All vehicles equipped with the EDC system (electronic damper control) are NOT APPLICABLE
  2019: Lowering Rate: F: 1.6-2.5" / R: 1.6-2.5" 42: Wheel spacers may be necessary if using stock wheels and tires. 06: All vehicles equipped with the EDC system (electronic damper control) are NOT APPLICABLE
  2020: Lowering Rate: F: 1.6-2.5" / R: 1.6-2.5" 42: Wheel spacers may be necessary if using stock wheels and tires. 06: All vehicles equipped with the EDC system (electronic damper control) are NOT APPLICABLE