Took a hammer to my fenderwells to make my box fit in the CRX, after stripping the interior. While showing it to a friend in his driveway (Steap hill) before securing it, did not see it slide back a inch and a half (took out rear window, left a cool shattered glass Orion decal though). Put my mustang up on its side, surprsingly the half wall in it didnt budge, the Fire Dept. was real impressed with my install and loudness. Also shook all sorts of stuff lose in CRX, but did not care cause the whoe car was a POS... Oh and can replace a Alt on a CRX in about 45 min or less... Had to replace mine 4 times, one $80 alt with a lifetime warrenty from pep-boys was easiest solution for me when I was in high school.