I had planned on getting the SLP SFC's mainly because they are the only ones I have seen that are bolt-on. I have my reasons for not wanting weld-on SFC's so I was wondering if there are other kinds that are bolt-ons besides SLP. I am asking because I just read that the SLP ones are really heavy, but by how much?? Well any info on other bolt-on SFC's would be greatly appreciated. Plan on putting them on my 93 Z28.