I have a 2008 E93 N54, rebuilt recently with 17t's, catless DP and exhaust, 2" inlets and outlets, index 12 injectors, Eldor coils, 2 step colder plugs, etc. I have just installed a 2nd walbro 450 fuel pump, Phoenix intake with PI (750cc injectors) and a BMS injection controller connected to the JB4 that I have had for while. I am trying to decide if I should pay for a custom tune (I was quoted $400) or just use some of the MHD ones for higher stages. If I use MHD, will I have to still custom adjust it? Is it risky to run and adjust an MHD pre-made tune? So far "tuning" for me has been just using map 5 on my JB4.