your motor from the factory is the most reliable. opening up and installing these cams will bring the level of reliability down. if reliability is what you seek run things within limits and make sure the person doing the work is competent and make sure you yourself has a level of competency that you know what limits are. A turbo motor at a small amount of boost on a oem motor is more reliable then tearing the heads down and replacing the exaust cams or cams in general.
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