the first thing you want to do is to have the motor mounts (engine mounts) inspected. Over time oil eats through the rubber of the front mounts and causes the rubber to break. When that happens the vibrations from the engine that are normally absorbed by the rubber mount can be transferred to the vehcile's body. It is not uncommon to have to replace the front mount after 5 years. If the mount is good, check the alignment of the heat shields for the exhaust system. if they are grounding out on the chassis they could cause the same type of vibration. Its less likely than the engine mount but common none-the-less.One charactoristic of the Civics is a "harder" ride than many cars. I don't know what you drove before but the suspension is stiffer than many other cars in the class. I have 3 Civics that all have a sportier feel. Of course, you do want to make sure the tires are properly inflated--if you have too much air the ride will be much harder.hope that answers your questions