How much is this Hooker costing me?

My car is a typical heads & cam (Patriot "LS6 style" & TSP 231/237) bolt-on car that has FLP's, no cats, and a Hooker catback.
How much power is it leaving on the table compared to true duals?
7 RWHP......and even less torque
The only suggestion I could offer would be to install a cut-out - - if you really want that extra little but not as an all the time thing.
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