Brock was running a Turbo R (turbo, <1000cc). Pro R is (I believe) in a higher class.
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Looks like stock arms, geometry, chassis, etc, with bumpers and upgraded cage to me. Stock class rules don't allow for complete rebuild of the car. Either way, the positive camber under droop, radius rods, and lower clevis didn't appear to hold him back as he finished a full minute ahead of RG. They ran the same route and the PoPo saw more abuse due to higher rate of speed, both survived. Cool. :biggrin:
That being said, yes, RG gives you something that is nearly race ready without needing the SCORE/Ultra4 legal cage (granted, you still need to do some minor things for legality in the Speed). That part is cool as well.