I would wait until they need done. One of my bags is still original, and holding strong.

Both of my sensors have been replaced and I have 0 issues with the air system.

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2002 X5 4.6is - Titanium Silver / Black Alcantara - Dinan Stage 2 - Bilstein/Eibach - Brembo BBK ----SOLD---
1993 318i - Brilliantrot / Tan - bone stock daily driver