This may not really count as tuning, but it's engine-related regardless. I have seen lots of questions regarding this on forums, so here's my short post on it; the OEM engine cover. These were only available on very early-production Titanium models and were then no longer included. They can still be ordered though. The install takes minutes.
Part numbers:
-Engine cover: CP9Z - 6A949 - A
-White studs (need one pack): CP9Z - 6A957 - A
-Black stud (need one pack): CP9Z - 6A957 - B
-Nut (need one pack for one nut): W520201 - S442
Before: Note the messy wiring sitting on top of the engine.
After: All hidden.
I had been on the fence about ordering this for a while, but as soon as it was installed I was glad I went and got it. Very much worth it. I will be interested in seeing if any aftermarket covers come out though.
