well there a bit more too it. you need new brake lines, rear hubs, rotors, calipers and e-brake line. and i think you might need to get the GTS master brake cylinder to support the new calipers. but its still pretty costly
Well from my understanding all those parts would be included in an aftermarket kit as well. At any rate, unless you spend a lot of time in reverse the majority of your braking is going to depend on your front wheels, I'd probably spend my money first upgrading there.