I presently drive an e-36 and am looking towards a 1998 540i with the (i think) 4.4l with a manual tranny...Not any specific one (yet). What kind of performance can I expect. I have heard it is a solid, well balanced package. I would be expecting to do some performance upgrades..Intake, perhaps re-mapping the ECU, or rechipping, etc....anyone have any info they are willing to share?????