I am planning on replacing fuel injectors. when I want to purchase fuel injectors some say they require ECU tuning. I am not sure what that is? is it to calibrate how much fuel flow, is it important? Thanks

Hello, I just purchased a 2007 335i used from a neighbor and I came to find out that he had installed a Vishnu Procede Rev 2.5 in the car. I cannot use this because there are no gas stations in Brooklyn within a reasonable distance that sells E85 gas. All the Vishnu maps require E85 fuel. So...

I've become a little bored of my M5 so now I'm looking to increase the HP!! I'm already running the MEISTERSCHAFT GTC + LXR PIPE which I'm extremely happy with ... So I'm thinking about doing a stage 1 ECU tune with the factory DP's ... However I've been going back and forth whether I should do...