I agree its overpriced (like most everything). All I will say is that "Rob" (not John) designed it. I race with him with the SAAC-MCR club at Waterford Hills Road Course, MI.
The nicest part about his design, is that it is VERY easy to install. He made use of bolts/holes/frame... to align the whole thing. You dont need a pro shop to install it.
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Darius Rudis
Roadracer: Home built t-arm/panhard suspension powered by an S-trimmed motor :-)
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