The cap nut that screws onto the studsis 2.8 kg-m (20.2 ft-lbs).

The torque settings from a stock exhaust VS the way TYGA uses a flange that the TYGA pipes slide onto and use springs shouldn't be that different. The stud and nut are still the same size and being used in the same application, which is what really determines the needed torque settings.
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Charles Gallant