some kind of bypass happening... quick question

[swerved300]

I'm installing a new headunit. Just came across this PO 'modification'. can anyone tell me what is going on here? It looks like the stock wiring has been looped back into itself, should I cut this whole connector out and wire the speakers up individually, or was this done with some kind of purpose?
thanks in advance, any help or comments are appreciated.

ps- i've got the equipment to solder

[StereoInstaller1]

No, that is factory.

What year/model, and assuming what I see there is correct, you have a late model with no fader on the dash.

[swerved300]

No, that is factory.

What year/model, and assuming what I see there is correct, you have a late model with no fader on the dash.

correct, and my apologies for not mentioning that. Yes, it's a 91 325iC. the purple(aftermarket RR+) is wired into blue/black, and the yellow(aftermarket LR+) is wired into yellow/black. this is correct according to your writeup.

here's what else though- all the neg(-) speaker wires coming off the old aftermarket plug weren't connected to anything. the other two positive speaker wires RF+ & LF+ were wired to blue and yellow dash wires(known to be stock) which were twisted with brown wires(which were connected to the aftermarket ground), is this correct also?

[StereoInstaller1]

Yes it is. One of the few installers who knows how to properly integrate a E30 amp!

Personally, I would bypass it.