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That would be in referance to the rear sub frame. It would mean that the rear frame3 rails have been removed, and replaced with tube steele. They also would have move them closer together, and put in larger wheel well tubs. This would allow for a large width tire to tuck under the fender. And then there is usually a coil over shock type suspension, with a four link system, or laddr bars. A lot of other things are needed now, as well. Fuel cell, aluminum floor pan, roll cage, frame connectors, ect. All in all, it is a lot of work, or a lot of money, either way. And, makes the car much less streetable. Race car stuff, only.

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13y ago

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