the mark VI jettas come with full synthetic, vw worked directly with castrol to develop a full syn for the new model year cars especially with the 2.5 sharing 75% of the blueprint with the ferrari v10Intake systems will take some time to develop since VW decided to put that stupid reservoir in the way where the intake would normally fit. The reservoir would have to be relocated. As far as exhaust, Techtonics tuning has one available for the 2.5 but it's pricey in my opinion. I would rather go with AWE tuning exhaust which will come out hopefully soon. They have one for the 2.5 Golf and it sounds great. Not ricey and no drone. I can't imagine that it would sound any different with the Jetta since they basically have the same motor. Chip tuning will take some time to develop since the 2011 Jetta has a different ECU than the MK5's. I agree with switching to full synthetic oil, but don't even mess with the tranny unless you have problems with it since it's a sealed transmission. If it ain't broken don't fix it.