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yes, bmw ws the first major manufactor/team that used a single roll hope for there cars, but. i belive the WR center seat wsc car was the first car/team to use it.
WR has a single roll hoop, they just have it blended into the car well.
the dallara cannot run a single roll hoop as that is grand am illegal. both the dallara and the factory R&S have gone to a full hoop.
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