Bilstein B12 Pro-Kit 46-180797 is a matched spring-and-damper suspension kit for the listed BMW 3 Series (E30) applications. Check the engine, original suspension and axle ratings below before ordering.
This package pairs Bilstein dampers with Eibach Pro-Kit springs. It provides fixed lowering rather than threaded height adjustment.
Lowering and axle limits
- Front lowering: approximately 30-40 mm
- Rear lowering: approximately 30 mm
- Maximum front axle rating: 825 kg
- Maximum rear axle rating: 905 kg
Lowering figures are approximate and depend on the original suspension. Factory sports suspension and vehicle equipment can change the resulting drop. Compare the axle ratings with the vehicle identification plate.
Vehicle application
BMW 3 Series (E30)
320 i, 323 i 09/82–12/91 92–110kW
Fitting conditions
- Requires 45 mm front strut housings. Check the housing diameter before ordering.
- Follow the approval document and installation instructions for this exact part number.
Installation
Follow the part-specific installation instructions and check which original mounting components are retained. Have wheel alignment checked after fitting and check any affected headlamp or driver-assistance settings against the vehicle manufacturer’s instructions.
Ordering from GSM Performance
This kit is ordered from our supplier. Contact us for the current lead time. Send your registration or VIN and original suspension details if you would like help checking the application.
Ordered from supplier. Contact GSM Performance for the current lead time.
Will this fit my car?
This listing is for the BMW 3 Series (E30). Chassis code, model year, engine and drivetrain all matter, and Bilstein often use different part numbers for cars that look the same, so check your car against the vehicle table in the description. It needs 45 mm front strut housings, so measure yours before you order. It is rated for a maximum front axle load of 825 kg and rear of 905 kg. Compare those with the permitted axle weights on your car's identification plate, not its unladen weight. If anything is unclear, send us your registration or VIN and we will check it before you order.
How much lower will it sit?
About 30 to 40 mm at the front and 30 mm at the rear. That is the catalogue figure: the real drop varies with the car's original suspension and equipment, and a car already on factory sports or lowered suspension drops less.
Do I need new dampers?
No. The B12 Pro-Kit is Bilstein dampers with matched Eibach springs, front and rear.
Can I adjust the height later?
No, it is a fixed drop. If you want to set the height yourself, you need a height adjustable coilover instead. Our guide Bilstein B12, B14 or B16: Which Suspension Adjustment Do You Need? explains the difference.
Can I fit it myself?
Our guide Fitting Coilovers At Home Or Having Them Done covers what the job involves. Either way, have the wheel alignment checked after fitting.
How long does it take?
This kit is ordered in from the supplier for your car. Ask us for the current lead time before you book the fitting.
