In addition to the packages, there are a range of stand-alone options, including heated front seats and blind-spot monitoring. Alternatively, you can opt for an upgrade that will offer enhancements such as ambient cabin lighting, LED headlights, a panoramic sunroof, and a 12-speaker Harman Kardon sound system. Exemplary In Every Way. Harman Kardon system (S688A) is present in 3, 4, 5, 7 Series and X5 BMWs, whereas Harman Kardon system (S674A) can be found in MINIs, 2-Series BMWs and i3s. The latter is a more modest upgrade over the standard HiFi system, still carrying the Harman Kardon brand.