Hello, I have a 2006 Mustang GT with Whipple HO intercooled supercharger, My first impression, after the installation It performed a brutal power, I come noticing, for some months, that the car does not have so much power as before, the access to the dyno this one very far. I have the pulley of 3.125 installed. He would be grateful they could indicate me, it forms of verifying the power, for exm., times of recovery between speeds, 3ª 80 Km/H to 120 Km/H., 4ª 80 Km/H to 120 Km/H., 5ª 80 Km/H to 120 Km/H., Or the test that yours. consider to be opportune. Thank you for his attention.