Mate use ECS tuning but my advice would be to grab some other small parts which you may need to replace soon to "share" the cost of shipping. I think their minimum shipping cost is $47 so just keep adding parts and refreshing the shipping cost until the shipping price vs amount of parts is acceptable to you. For example an oil pressure sender is only $10 as opposed to $50 from BMW here and you will most likely have to replace it at some stage and its small, also filters are light and always need replacing so shouldn't add to much to the cost of shipping

I'd be replacing the FSR as first port of call - There are so many write-ups on it failing its not funny

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2004 E53 4.4L N62