if it's an authentic oem Honda si lip, then installation is real easy. Pepboys and autozone carries the needed bolts, washers, and clips. I use #10 bolts with washers and a #10 foldover clip bracket nut for all the bolts underneath the bumper. On the sides of the bumper u need foldover clips to mount on the bumper and 4 screws to fit in the clips. The back of the lip should have like 8 brackets on it that correspond to holes underneath the bumper. Just bolt everything together and use double sided tape if u have any gaps.