What is the fine-grained topic of the following text: They installed a carbon air filter, custom racing exhaust system and remapped the electronic injection code fields to increase output to 628 HP (462 kW) and 600 Nm (442 lb-ft) compared to the standard 525 HP (386 kW) and 530 Nm (391 lb·ft) of torque. Only return the topic.
Car performance modification