I like my built in K40. I have a several year old model. It is FAR superior to the 9500 Escort built in, IMO. I NEED front and back radar detection here in Jersey. The K40 has it, the Escort does not. Of course, the V1 or windshield Escort does. But, these are not stealth. Mine is really uber cool built in...... Done privately btw.
2009 Space Gray Carbon Leather E90 with DCT, Tech package, and EPS. Mods: Fabspeed 200 cell cats, Xpipe w/resonators and no secondary cats, BPM tune, Euro DCT software, Eisenmann Sport Mufflers, Vorsteiner Rear Diffuser II, SWS8 subs, JL Audio XD400 bridged 2X200W, built in radar