Brakes

Has anyone seen or used some of these kits that use the stock calipers with 14in. rotors? They come with a relocation bracket for the caliper so it will fit over the bigger rotor. I realize these won't be as good as a full on big brake kit but was wondering if there would be a performance gain with one of these setups.
 
How much is the kit? It might be worth getting a set of take-off GT500 brakes off Ebay, there are some good deals if you are patient. Just better pads and stainless lines would probably more of a difference than a rotor swap.
 
Increasing rotor size and not also increasing caliper/pad size will not increase breaking performance. The pad will have the exact same size contact patch as the stock rotor...