Going to front half a car soon and need to cut the upper bar about 12” - 18” behind the motorplate, I realize I need to butt weld and have piece of tubing inside minimum 3” inserted from both sides of weld and a rosette welds on both sides.My question I cannot find if I can do this but I do read “butt weld splicing upper frame rails to the shoulder hoop is permitted between the centerlines of the forward roll cage hoop and forward seat uprights. If butt weld splicing is used here, an interior sleeve is required, extending a minimum of 3” on each side of seam.” I also see that “butt weld splicing of the shoulder hoop is also permitted in the rear center. If butt weld splicing is used here, an interior sleeve is required.”