Quite pricey, but MaxChip seems ideal for Diesels to utilize that torque:
https://maxchip.de/en/catalog/produc...w/category/95/. They, however, don't seem as great for the petrol engines:
https://maxchip.de/en/catalog/produc...w/category/95/.
RACECHIP TB ULTIMATE: 507hp (currently at 522 with D setting) and 564 torque
MAXCHIP TUNNING: 477hp (not sure about their settings) and 543.6 torque. Huge price difference as well.