I've been all through my IHRA rule book and all I've found is that a "shielding" is required on all rear engine cars where the brake line passes the engine area. Can any one elaborate on what is actually accepted?? Tube wall thickness? Scotch Tape? Bubble gum? The wording is pretty vague. I was going to just put the line in the lower chassis tube, entering at the master and 'doubling' the tube intrusion with a "tube blister", but I'm having second thoughts now. Thanks.