SR068 Exhaust bolt repair kit for Porsche 996 / 997 GT3. Avoid the headache of trying to drill out broken exhaust bolts on the GT3 engines. A CNC milled plate indexes precisely off of the broken bolts and/or bolt holes. Using our uniquely designed Thumb Screws, the SR068 plate is locked in place (by threading a Thumb Screw over a broken bolt or by using a supplied bolt threaded through the SR068 Thumb Screw). With the included pilot drills and drill guides, the faulty bolt can be drilled out, producing a perfectly perpendicular and centered hole that if necessary can be chased with the supplied M8x1.25 tap.