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To add my experience. I had cracked intake boots. Where the intake boot bolts onto the turbos. There was evidence that they had been cracked for awhile, as there was oil residue around the outside turbo intake housing.
On occasion I had very rough cold start idle ranging from 400-1500 rpms. Since installing catless dp and rk intakes which led to finding the cracked intake boots. Replacing the intake boots. Flashing bm3 st2 no cold start. It starts like dream for 2 months straight.
Hopefully this isn't the case for others but worth a check.
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