The Civic Si is far from "ricey". It has the biggest engine of all the Civics.. Plus it made the Car of the Year in Motor Trend! If thats ricey then I like my ricey car.Now for your question.All Civic's should ride about the same. The Civic handles really good. And there are no cars that are 18000 that are going to be silent on the inside. I am sure nothing is wrong with it. You cant fix a car being too loud.Just to be on the safe side bring it in and get your tires checked for air pressure. And if its still kinda loud maybe balance them.. thats the only thing that could cause it.