You can replace the bra. If the car is your daily driver, you'd probably end up wanting to replace every four years. Sooner if you let the car sit out in the sun, or if you don't keep it waxed. You also need to be careful to remove bugs and sap, otherwise they can stain the material.
I bought a kit online and applied it myself - I wouldn't recommend doing that, you don't save much money, and a pro is going to do a much cleaner looking install IMHO.
-james
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'01 Boxster S, 51k miles
'05 Mazda 6 Grand Touring Wagon
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