A great step - easy to implement too.. A definite recommendation, for the stock configuration. Id implement that just to save on parts as those rotors are getting harder to find and expensive. The dealer here has them at about $600 a rotor. I do see that cars with warped rotors will over time also develop dried / overheated wheel bearings. So by having ducting, one may have not only saved a rotor but gained more wheel bearing life at the same time.. Im not saying that happens all the time, but it is more apparent over time.. I havent seen too many issues with the rears on Jalpas sometimes mild warping, and the emergency cable giving away, usually due to corrosion of the cable in the jacket. Not sure if they arent lubed regularly, or if the heat of everything bakes the grease out that was in there . On a different note, overall, Its rather nice to have a car that has a great front to rear weight distribution out of the box: not only does it help braking, but makes everything more fun..