Doing ls swap and outing the ls swap long tubes headers in on a 88-98 obs truck. On the passenger side you need to take the lower heat shield out and bend the the lip on the firewall to the floor pan. And twist till it slips in place.... that's the bitch side on the drives side take the heat shield off also and bend the lip too then take the coil pack off an wiggle it do till it slips in place....