So these motors don't seem to have as big issues with DI port carbon as others do.
I also had a good run with my VK45DD cima, it did develop a light missfire at idle at around 300,000klm so I started using the subaru upper engine cleaner with each oil change and it improved (still happened occasionally)
So, my plan with this car is to add a catch can, do upper engine cleaner with every second service (ie every 10,000klm) and see how that goes, I'll pull the intake off sooner or later and have a look at the valves too.
On the ECU, you need an Ecutek tune; the Redsport ECU will expect sensors (turbo speed) and the 2nd water pump that the base model doesn't have...but I'd expect a tune (mostly more boost) is all you need to get there.
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