Holden Captiva: Broken muffler

The Captiva V6 doesn’t reach its peak torque until 3200 revs so it’s hard to know why you feel it dropping off after just 2000 revs. The exhaust system was primarily designed as a fuel economy improver; the engine also has constantly variable cam phasing and that’s the main system that allows good low down torque as well as good top end performance.