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  1. bigreed91

    HP Gain?

    So i have a 1989 Mustang GT convertible and i was wonderin what kinda of gain ill be lookin at with the following parts: 1. 65mm throttle body 2. 65mm EGR plate 3. B303 cam 4. underdrive pulleys 5. new an bigger mass air meter 6. 19lb. injectors 7. smog pump delete kit 8. A/C delete...