for DX, LX and EX, the Coupe has Sport front seats.(read: holds you in better when cornering).The sedans also have a 2 spoke steering wheel while the Coupes have a 3 spoke. in the Si, both the Sedan and Coupe have Sport seats up front, and both have the 3 spoke steering wheel. they also have a slightly different door mounted armrest design and mirror controls.other than that they are the same.