I purchased the 2006 Honda Si after a great deal of research and many vehicle test drives. As a matter of fact, I test drove it, then called the dealer two hours later and told him I wanted it. After owning the car for a day, a rattle developed in the back. I began searching for the cause and determined that the passenger side rear seat was not latched - problem solved. When cruising, the car is very quiet, but accelerate up through the gears and the tuned exhaust sings as the engine tachs up. Cornering is a dream in this car with virtually no body roll, and the deep buckets really hold you in place.