I received my new JC chip yesterday and was supposed to wait till the weekend to install it, but couldn't resist. I put my baby ('91 525i auto) and in a matter of 45 min, I was cranking it and drove it down the road. I was not able to open it up, but did notice a slightly smoother idle and a little more pick-up on initial acceleration. I'll try it tomorrow on the highway and will let you all know what I think. By the way, I couldn't have done this or many of the other dozens of fixes and upgrades if it wasn't for this board. Thanks to all. JIm V.