[Moonesar]

I just purchased MTX Subs and amp and 4guage wires to hook up to my stock E90 325xi.

I was informed i need some type of aux adapter that has rca cables to hook up the amp to the stock head unit but not sure where to find them.

I search crutchfield but couldn't find anything bmw specific, anyone know where i can get this item or if i even need it? Maybe i need more?

I searched but got miminal help.

Thanks