Confirmed.
31 33 6 860 629: B1-Front coil spring
33 50 2 320 928: B1-Retrofit kit sports suspension
33 53 6 860 618: B1-Rear coil spring
Fit a 2016 RWD 6MT 228i with zero issues. Aligned to factory spec. Drop is exactly 20mm. Ride is perfect. Nice and flat. Not jouncy at all.
I have had a 2014 228i 6MT RWD with the 704 M-Sport, this 2016 228i 6MT RWD with base suspension, and now the same 2016 with the M Performance Suspension (p/n's above).
This is the best of the three. Well worth the hassle. It is a shame that BMW NA removed the official compatibility for the US.
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Current: 2015 BMW X5d | 2017 BMW M2 | 1976 BMW 90S
Gone but not forgotten: 2016 BMW 228i, 2014 BMW 228i, 2008 BMW 535xiT, 1998 BMW 328iC, 1991 BMW 325iC
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