Some companies like OEM Audio plus and Taco Tunes will develop aftermarket upgrade kits. Anyone seen anything like this yet? I don't want to add a Beatsonic and I'm just looking for a bit more soundstage, clarity and bass. A local audio shop wanted 12K to upgrade the system and If I skipped replacing the speakers, they graciously dropped that estimate to 4k. Crutchfield thus far is not listing anything for the 250 yet.