Ive never really dealt with trunks much....but i have my 18" MT in a 5.5 ^ 3 box at 49hz in my yukon and im running it off of my orion 2500d at 1ohm and im putting up 149 on the new TL, so in a small *** civic i have no idea what kind of numbers you would be put up....but my guess is it would be...