What is the difference between the Audi A4 45 and 55 models?

I am looking to purchase an Audi A4 and am wondering if there is a significant difference between the 45 and 55 models.

The main difference between the A4 45 and 55 models is the engine. The 45 model has a 2.0L turbocharged four-cylinder engine while the 55 model has a 3.0L turbocharged V6 engine. The 55 model also has more horsepower and torque, which results in faster acceleration and a more exhilarating driving experience.

While the main difference is the engine, there are also a few other factors to consider. The A4 55 model comes standard with Audi's Quattro all-wheel drive system, while it is only an option on the 45 model. Additionally, the 55 model also includes a sport-tuned suspension and larger brakes for improved handling and performance.