106-15 On MY1997-2008 Porsche Boxster, Cayman, and 911 models, ARP Fasteners are available for the stock "cracked-cap" connecting rods addressing the well known bolt stretch failures leading to catastrophic engine failure on cars that are used on the track. Similarly, on engines that have been used on the track, shuffling and fretting/pounding of the main saddles has also been documented due to stretching of the crankshaft carrier bolts. Not for 911 Turbos, GT2 or GT3. Price is for 12 bolts.