Just down thr road in Oceanside, CA one young man dynoed his stock GT and then put on the BTG Dual stainless system. He then proceeded directly back to the dyno to discover 20 more "at the wheel" horses.
My guess is that BE(before exhaust) your PT was spinning a lower gear because of lower HP. I have found that power is a function of rpm, and, for the same rpm my GT has MORE power.(I too have the BTG Dual system.)
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