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Did this mod to my 2017 X1 28i.
Very simple, just grab a set of pliers and punch the c-clip and if will pop right out. By hand, flip the flap into the open position and it should stay. Mine did and have not had any issues with it.
Sounds better and the black buildup on the tips is now on both and not as significant since it's mitigated over both tips.
Idle is deeper and sounds way better.
I notice some more burble when upshifting and occasional downshift pops when driving hard. Mm
No drone or codes or issues.
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