It's not actually the intake manifold gaskets, they have no coolant running through them. The intake does need to be removed to change whats under it... the valley pan. That is what leaks... and it's not the easiest or cheapest job. It is actually the hardest coolant leak to fix labor wise. And it is a good idea to reseal the intake while it is off (all new gaskets at the end plates, throttle body, etc.) And the coolant transfer piping from front to back is R&I'd during this, so a couple more coolant pipe gaskets and o-rings. And the crankcase vent piping that runs to the underside of the intake also usually falls apart when removed and should also be replaced. Pretty much it would best be done by either the expensive dealer option or an indy that specializes in bmw and has done this a few times before. But it is about an 8 labor hour job...

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2003 4.6is