Well, after searching EVERY post on 2455's I bought myself a pair of ceramic coated hookers. I have a 67 and they fit with just a bit of tweaking on the #5 pipe just like everyone has said. The # 6 pipe comes very close to the frame rail, ( about 1/8" )but at least it doesn't touch. I don't think the 2455's hang down as far on mine. I think ground clearance will be fine. Mine seem to hug the cross member tunnels quite nice. I'll post pics when I start to put her back together.