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I've also just completed this upgrade also,
My wagon is the 5.0 Xdrive and currently I have the following completed.
F10 M5 Headers
F10 M5 Turbos
Straight Race downpipes installed.
ESS tuned
Custom charge pipes made to keep the original diverter valve which currently vent to atmosphere. These will be changed soon to electronic Turbosmart blow off valves.
My friend and I are currently waiting to fabricate a custom intake filter pipes to drop in somewhere behind the hood grills.
A note on the above post, I have the F10 M5 intercoolers and they defo don't fit. They are simply to big and also they have two areas of recirculating the coolant through each intercooler. I suppose either a bypass system or a loop system could be fabricated to make them work but I don't know where they would fit in such a tight space.
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