Job 1 was the first production run of STs and ended in June 2000. The remaining 2001 STs are Job2. The Job2s incorporated fixes for such things as the gas door rubbing when opened and scratching the paint, fuel pump problems causing hard starts, and a refined hood latch (around 9/00). There are other differences as well. The intake manifolds and valve covers are different and the oil fill is on opposite sides of the engine. Also, Mandarin Gold was dropped and replaced by Silver Frost. If you want more detail, you can do a search, this has been brought up several times.