Discussions about BMW vehicles

Hi,
I have been trying to find any info I can on JPS model BMWs and was hoping
that you might be able to help me with this
The reason I am trying to find out more is that I have recently purchased
an E30 model 323i, which has JPS mods on it..which I thought were just
added by the previous owner, seeing as the car is Polaris (Silver) in
colour and not black with gold stripes. But what has bemused me is that in
the log books..at the time of it’s original sale…it states that the car
is a 1985 323i JPS
So if you can help me I would really appreciate it :)
John