I had a DTUK one on my previous V50 2.0d
It was fitted by a previous owner, (circa £350)
I ran several experiments on the settings and running it without it fitted at all.
I can confirm that there was a sweet spot (medium power setting) that gave notable performance and fuel economy gains.
IF I was to spend my own cash on one for my D4, I'd go for one from DTUK as I have previous experience with them.
If polestar was an option on the D4 I'd have that but with software updates being done with Volvo for a lot of issues/servicing I'd fear 'losing' a remap done by a third party.
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