Everything is relative.. I'm sure there is a guy in a Sentra saying if he was driving a 370Z he would be happy with it as is.. because the level of performance is on a different level.. kinda the same with the GT-R.
It can ABSOLUTELY big improved upon, but like anything takes the right product selection, and factoring in what the vehicle's plans are.
Take for example our Carbon Ceramic Brake Rotor upgrade.. one of (if not the only) aftermarket Carbon Ceramic upgrade in the world, when you normally find these setups on high end Ferrari's and the supercars of the world.
May seem expensive up front, but these rotors basically don't wear out, as the factory ones do, so over owning the car for years, this is actually an economic upgrade, in addition to the superior performance (and coolness factor..
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