Whopperoni

Hey.

Currently in the process of changing thermostats (auto gearbox, 530xd), and I've seen people recommending (and linking to) a dead forum post supposed to contain a guide for an inline thermostat mod for the heat exchanger which is supposedly better and easier than replacing the heat exchanger.
Since all the links I've found through excessive googling and forum lurking, does anyone here have this guide saved or remember how to do it, and if so - which VAG thermostat is needed?
(Link to dead forum post that I keep finding: https://forum.bmw5.co.uk/topic/13244...nger-write-up/ )

Side note:
EGR thermostat has already been swapped. It's now running at 6.4L / 100km or roughly 37 mpg currently on the highway. Stage 2 tune, DPF and cat deleted, and it's only running at 60 degrees celsius. With any luck, it'll be down to 6.0L / 100km or ~39 mpg once it gets back up to operating temperatures.

Whopperoni

Managed to get a reply and a photo from a member on an M57 group on Facebook.

The thermostat needed is: 4E0121113

This is where the thermostat goes, but he also said that the thermostat is upside down in the picture:


And to make things more clear, this is a better view of which coolant pipe to cut and where to place the thermostat:


If anyone has any input, please feel free to share.