It all depends on what was wrong with the original system to start with? If the bags, sensors and compressor are good then I would keep it on air suspension. Did you reset the system for testing before you converted up coils?

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BMW X5 E53, 4.8iS - 2005
Professional Stereo/Nav with DSP (modified BM54 module) - Converted to Eonon GA5166X with Reverse cam
4-Corner Air Suspension - Converted to BC Coilovers