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Facts: To get 20HP out of the boxster (2.7L), you need to do one of the following:
1. Decrease manifold air temp by 4% absolute (about 50F)
2. Increase manifold air pressure by 9% absolute (about 1.1 psi)
3. Increase overall thermal efficiency of engine by 10% abs (3% of fuel heat val)
4. Increase lambda number by .08 (to 12:1 stoicheometric rato [13.1 is stock])
which one of these does a muffler do? or an intake? discuss.
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