I wouldn't worry about the frame being stressed. Ford produced a Shelby GT convertible with the FRPP suspension. I don't think that had any special bracing, aside from the strut tower brace, which didn't do anything on my coupe.
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2006 Mustang GT
5 Speed Auto
NOS Single Port Wet Nitrous Kit (75 shot)
93 Octane tune from Bama Chips
FRPP 3.73:1 Gears
Steeda Intake
Steeda LCA/Eibach Sway Bars
FRPP "Stinger" Axle Back Exhaust
BBK Shorty Headers
19 lbs OZ Racing Wheels with 255/45R18 Tires
Daily Driver: 2009 Pontiac G8 GT
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