Tuned properly, there is a greater potential for the Motodyne E370 to make more horsepower, then a cheap Taiwan made exhaust. The Gemini won't produce any more hp then it is now, no matter how well the motor is tuned. Any additional bolt on's will actually be hindered by it. This is what Tony was trying demonstrate and explain
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It always takes $'s + time, installing, tuning, and tweaking to = hp but some will never understand or have the capacity to.
One shot on a dyno isn't going to magically produce additional horsepower. That's nothing but false hope. It is what it is.
