[Aspen235]

Focal ifbmw-s (separates)
Focal ifbmw-c (coaxial)

The separates come with an external x-over in the wire harness and a silver bezel for the tweeter. I took my stock sails, cut out a hole with a saw, cleaned up with a dremel sander and pressed in the Focal tweeters. Looks good especially for no extra costs. Sounds great, but a new amp will be needed eventually.

if you replace the front, and rears with better coaxials with tweeters you end up at 12 speakers in total. The HIFI stock system only has 7 because the front door, centre and rears are all "full range" single drivers of dubious quality.