i think the racing community is hard to judge by, as most boxster race cars are spec, and addnl reinforcement is not allowed? regardless, i agree that the focus should be between the wheels. the doors are structural members in this car - perhaps a way to get more positive engagement between door and frame? sounds like a lot of work. tunnel reinforcement? the brackets that hold the coolant lines in the tunnel are already quite beefy and, i presume, intended for reinforcement as well. ultraracing did get back to me and weren't able to provide any pictures of their product, let alone of it installed. just photoshop i guess. really, i can't see a way to improve on the brackets already there without getting in the way of the underbody panels.
i think brad had it right - additional cross-bracing in the pssgr footwell area is the ticket - tie-in to some of that super strong green and yellow steel in the previous image.
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