Originally Posted by nukezero
Holy shit, talk about thrust!!! My car just turned into a 345i.
more like a 350i
But yeah, the noise you were hearing is the fuel pump running while the DME was programming. Totally normal. In the future, I'd recommend turning off the daytime running lights (or connecting a battery charger) before flashing the DME. It's best to keep the system voltage in the 14's if you can.