I have a 1998 328I (5-speed), and I was considering putting a Conforti performance chip in it. However, when I spoke to my mechanic, he told me that I should reconsider. See, I am planning on moving out to California, he knows this, and he said that this chip requires 93 octane, and 91 is all that is available out there. Can anyone confirm this information? Will I have to remove the chip if I move out to LaLa Land?