Chev. impala, automobiles

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ok. I have bought a new Impala LS FlexFuel (2007) now I am trying to understand why the back end is so much higher than the front end. other Impalas I have seen are not like that. My hubby says it was being converted to a SS, supersport model, but I dont' understand what the difference is. The tires are bigger - I think they are 18 inch. I am used to driving a 97 Ford Taurus so this car is a whole new ball game to me. Can anyone explain to me the difference in supersport and LS? what is LS for anyway. I need this explained in simple terms. ON-line sites uses terms that I am not familiar with since I am not a car buff or whatever! HELP EXPLAIN THIS TO ME PLS!