2004 EURO-R CL7

[specialis]

Hey guys i'm new to the forum ,i own a 2004 euro-r accord cl7 6 speed,k20 motor...I have a problem and wondering if any one can help me when driving and reaching a speed of about 65-70 mph the car seems to vibrate or shakes so i was wonderin g if anyone has an idea whats causes that problem?