That's very interesting indeed. Looking at the dyno figures you have posted here, I make the following comparisons with the ECU re-flash figures posted on here:
Your Set-up Power: 60.48hp @4500rpm
ECU reflash two pipes: 63.71hp @5000rpm
Difference: 3.23hp in favour of the ECU reflash
Your Set-up torque: 77.59lb-s @3500rpm
ECU reflash two pipes: 75.05lb-s @3500rpm
Difference: 2.54lb-s in favour of your Set-up
Since torque is much more important than the little gain in hp at the top of the ref range, based on the figures supplied I'd go for your (or equivalent) Set-up any time.
Of course the ECU reflash provides some other features such as lower idle, different cooling fan response times and a higher rev-limiter response (which is beyond max hp rpm and therefore of debatable benefit).
It would be interesting to see your Set-up and the ECU reflash combined.
Given that the ECU reflash requires premium fuel as well....you be the judge.
I know, this posting might be controversial and surely will not earn me the popularity of the month award. Nevertheless there is some soul searching required. Is the ECU reflash on here over-hyped
Watch out Pickel, incoming.