I bet you'll get about another 10-15 more HP... I have been down this SD and Mass air road before with both my car and with cars at kennedy Dyno tunes and they agree as well that a SD system can be ok for mild stock applications but for modifications, Mass Air is the way to go.. In your setup, your computer isn't seeing the added airflow that the porting has done for ya, therefore not adjusting accordingly. you have basically made the stock readings more efficient hense a few more HP. If you can monitor that airflow you'll be making even more HP by matching the fuel to it.
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