If I may hypothesize here, the torque curve will simply shift to the right on the dyno graph with only an exhaust size upgrade with no tune or cam replacement in mind.
edit: wait wait....if I have this right in my head, increasing the exhaust size too much would cause the curve to move to the right (RPM range). Why? Well I figure too large of an exhaust would take a higher amount of exhaust pressure to create velocity, in other words higher RPM's needed. Too small an exhaust we have a restriction of the velocity trying to release.
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