What is the difference between the Audi A6 45 TFSI and 55 TFSI models?

I am looking to purchase the Audi A6 and I am wondering about the various engine options and what sets the 45 TFSI and 55 TFSI models apart. Can someone explain the technical differences?

The main difference between the Audi A6 45 TFSI and 55 TFSI models is the engine size and power. The 45 TFSI has a 2.0L 4-cylinder engine with 248 horsepower, while the 55 TFSI has a 3.0L V6 engine with 335 horsepower. This means the 55 TFSI will have faster acceleration and more power overall.