I did a complete gut of the stock system, and I had the 'ultra' or Carver system.
All 3 systems offered in the Z are pretty pathetic IMO, even compared to other OEM car systems, even compared to other BMWs.
If you really care about the sound in the car, order the cheapest OEM system possible and save your money to upgrade it later. If you only slightly care about the sound system, order the middle-of-the-road setup, that gives you the 10 speakers (instead of 6) and at least you'll have something.
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