Hey nigwhyrito...sounds like you're doing an aftermarket solution that I've been thinking about for the last 3 years. Let me know how it turns out or if you can document the heating elements used and wiring that you're putting in place. I'm not much of a wiring guy, but I've read all the wiring diagrams and understand what goes where and does what, but actually wiring it together with aftermarket elements is a bit of a mystery for me.

Also, if you don't have the relay in the rear fuse panel, you might need to buy one.

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2000 Z3 2.3 Steel Gray
2004 X5 4.4i Jet Black