I believe that it is out of production now, but Xenon made a polyurethane front air dam for the 1st gen Rx7 that was nearly indestructible. It'll likely take some digging to find one, but I think that it's the best way to go for ease of use and durability. On the down side, be aware of ride heights as this air dam has been known to get below legal levels (ask Freddie Klopper, who got DQ'd during the ARRC weekend).
Scott "Righty" Franklin
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ITA/IT7 Rx7
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