Saleen Setup

Hey all I had a quick question to run by everyone. I was thinking, the Saleen S281SC is running of course the same supercharger and tune setup as me. The only thing is, the exhaust on those cars are made to have dumps on the exhaust after certain RPMs or on WOT. They're actually tuned to make more HP that way. Would that effect me just having aftermarket mufflers and no dumps but the same tune? Is that why my exhaust always sounds bad when I floor it?

The exhaust system is an innovative variable design, featuring twin mufflers with vacuum-actuated valves that open above a specified back pressure. When these valves open, a portion of the exhaust gases is routed through a second set of tail pipes pointed at the ground which allows the engine to be calibrated to produce higher torque and non restrictive flow.

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