You can look at it this way too:
1) Your increased HP (11) cost about $181 per horse ($2,000/11).
2) Comparing a 2007 987 vs. 987S the HP increase is 50 and costs $9,900 or $198 per horse. A 2006 comparison would be $242.50.
Looks like you did OK. The most important thing is that you are happy. And that has far greater value than anything!
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