I have the Dinan throttle body, engine, and transmission software on my 04 3.0i. I didn't opt for the exhaust because I had something else in mind that I wanted. Since they did not offer an intake package besides a K&N filter swap, I just made my own using a filter and intake piping. The signature package gives it just a little bit more power, removes your speed limiter, and raises your rpm limiter to push out more from the engine, but I just feel it was a little bit too much in price for what you get in performance. It bumps you up 10bhp in power and 12 ft.lbs in torque.

Supposedly, BMW tunes down the engines slightly on their cars so that people dont push it to their true limits and possibly damage them in the process. Care needs to be taken when you really push an engine hard and they cant trust every owner would do so.