I want to chip the car with a used chip from a guy with a good reputation on a local forum.

It is an "ST Tuning" chip manufactured in (W?)Germany during the lifespan of the m20s and was supposedly doing very well in the 325i it was in.

First I'm wondering if anyone has heard of this chip - it is a lousy one to google.

And second I'm wondering what could go wrong if the chip is no good. It has its own dme (y it is the same 173) and doesn't need a maf so it will be a cinch to put in but should I double-check anything on it or my own motor first?