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  1. N

    How much power can I safely add

    Thanks, 17K miles and is a manual with no other mods, tires are 235/50 Pirelli P Zero Nero . The supercharger is the Roush M90. This is just going to be a street car .
  2. N

    How much power can I safely add

    Here is a picture
  3. N

    How much power can I safely add

    I recently bought a 2010 GT 4.6 with a Roush Supercharger and before making some mods interested in how much I can HP I can safely add. Also interested in going from 3.31 gears to something like 3.73 or 4.10 any suggestions. Thanks

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