Fuel injectors directly affect the air/fuel ratio for the engine and new fuel injectors do require a new or updated tune. We also suggest that you check the other component of the engine before installation. No special tools are required. It is easy to replace old fuel injectors. Each fuel injector has a protective cap that must be removed before use. For Toyota Fuel Injectors Nozzle 23250-0D030 23209-0D030 0280156019 232500D030 232090D030 Exhaust Made of metal, the nozzle is strong, non-aging, durable, guarantees strength and durability, and has a long service life The injector has durability and reliability, and can maintain stable performance even under harsh working conditions, Manufacturer: ZXCTQQS