Q:What is the 605 relay & why would I want to remove it?
A: Relay 605 is the Servotronic steering boost relay. Basically this relay is supposed to make the car easier to turn at low speeds and while stationary. In reality, it boosts steering all the time at any speed. This relay is an option in Europe known as "Servotronic Steering." Removing the relay just makes your car like a standard European specification allroad or A6. Many people have complained that the steering is to light or is overboosted. With the relay removed, the steering is a bit more heavy feeling than my S4. Without the relay, the car has a more sporty feeling, which is a positive improvement IMO.
Taigi kas bus jeigu servotronic'as neveiks