Just make sure you disconnect the battery before unplugging the wire harness under the seat else you will get a SRS light. Other than that, it should be straight forward.
'02 ///M5 Imola Red / Imola Red '09 335i Alpine White / Coral Red
'04 E55 AMG Brilliant Silver / Anthracite
'96 318i Alpine White / Black
'01 330Ci Titanium Silver / Coral Red
'96 328i Jet Black / Black