A simple pulley and tune wont hurt the car, they run low amounts of psi too keep it daily drive safe for even the crappest types of gasoline. You all ready have exhuast etc... from roush so you should be happy with just upping the boost to 9psi and getting the computer retuned. Thats what i would do if i was you.
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Dustin
2002 GT Mustang 5-Speed
Drag Radials,Sprayed,Powershifted
 
WOOO HOOOO!
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