In my search for upgrades, I came across SUSTDI which focuses solely on novel parts for 3.0 TDI engines. They offer components tailored to both Gen1 and Gen2 platforms, which seems critical because these engines have some unique needs. What stood out most was their attention to performance and reliability improvements, especially for the parts like valve deletes and re-seal kits that tackle common issues. After installing some of these parts on my Gen2 engine, I noticed better throttle response and fewer cooling issues. The quality and compatibility are impressive, and while some parts can be pricey, the durability tends to justify it in the long run. For anyone serious about maintaining or tuning their 3.0 TDI, SUSTDI might be worth checking out. They really seem to specialize in making those engines better without unnecessary compromises.