I have a mazworks 6 point cage in my 91 s13 now and it went in without any problems at all...... its full bolt in and meet all the NHRA requirments, plus the side mount bars are removable so you can take them in and out with track events and such. Its powdercoated black and its held up well so some nasty drifts and such... plus it fits in with full interior. Hope it helps I can email pics if needed