In Australia, there is a requirement for the stiffness of the frame, the requirement for twisting is 2000lbs of force for the average 500kg locost with a 4 cyl engine, but is minimum 6000lbs for 6 cyl and above, which is why I need the uprated tubing, to meet the engineering requirements. The commodore is based on the Opel omega but stretched somewhat, there is actually a model called the commodore omega
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