I bought a used 2011 550i with 25K miles with the Dinan Stage 3 performance software, upgraded suspension, and free flow exhaust (Dinan is the only BMW approved performance upgrade company matching BM...
I bought a used 2011 550i with 25K miles with the Dinan Stage 3 performance software, upgraded suspension, and free flow exhaust (Dinan is the only BMW approved performance upgrade company matching BMW's warranty and still qualifying for extended warranties from Fidelity). The Dinan upgrades TOTALLY change the car. Before the upgrades (I have driven stock 550i / ix's before) it was a very nice, sporty car, but a bit too "luxury oriented" for my taste and I really wanted the combination of a great daily driver AND a beast of a sports car (but the older M5s are more expensive, the new one $100K+, and all terrible on gas at 10-13 mpg). Now I have it. It is a fantastic car with the Dinan upgrades.... You get the best of both worlds because of the Sport Transmission settings and the Turbo engine. In Normal Transmission mode keeping the revs under 3,000 (i.e. not engaging the turbo), I got 20 miles to the gallon driving it 500 miles from the dealership to home. By the way, with the 8 speed automatic, it does only 2,100 RPMs at 90 miles an hour (and feels like 50). However, if you want to have fun, the Dinan Stage 3 takes it to 511 horsepower (from 400) and 580 ft/lb of torque (from 450). 0-60 in low-mid 4s and doesn't stop all the way up from there. It is actually hard to keep it under 100 on the highway. It is faster than anything but the latest 2013 M5 (although Stage 4 would fix that, Stage 5 is also coming), is cheaper, more fuel efficient, and can be a great daily driver.
- Sound System is great, but my 2008 750i sounds a little better (significantly better bass). Also, to get the Playlist option for a loaded Music library took me 5 tries and lots of research to get working since there is no explanation in the manual or on BMW's website. Water under the bridge, but a huge pain for a cool new feature (I have my entire music library of 25 gigs of music loaded into this car).
- I don't like the new seat adjusters, but you can deal with it.
- Options: I wish it had the Active Ventilated Seat package. It really makes a difference on long trips (with the ventilation) and sport driving with the side support. Heads Up display would have been cool too, but probably not worth the money.