Although the peak horsepower is nice the thing that stands out to me is the point at which the HP takes a steeper jump. Stock is around 2250 RPM but in both of the SS exhaust runs it starts this climb at 1250 and 1600 rpm. That seems like something you would feel. I know this may be difficult but it would be cool of anyone who has access to these different cars could record the exhaust sound throughout the rpm range. Ideally it would be the same person doing all since then the comparison would be truer than different recorders. The SS exhaust compared to stock compared to the island turbo etc.