C4 no flex frame stiffener bar system benefits will work on both the coupe and the convertible there will be noticeably less body twist and roll when driving makes the frame more solid so the front end will not flex when driving on curves.
C4 corvette frame stiffener.
Underbody bracing was found to be a simple solution to the frame instability issue.
It s a frame stiffener bar system that puts the framerails in compression not allowing the framerails to flex under load.
The x frame is used to stiffen the frame and body.
Coupes benefit greatly from the addition of underbody bracing.
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Take the top off before installing the c4 no flex frame stiffener bar system and measure the distance from the windshield header to the halo with the car sitting on the ground now jack the car up on either side and retake the measurement.
As a result all c4 convertibles were equipped with an underbody x brace.
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Vette2vette products calls it their c4 no flex kit.
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With the c4 no flex frame stiffener bar system installed you should be able to open either door or hood with the car jacked up.