lol it takes the same time and money with the gsr, a 50 or 60 trim turbo, $100 cast turbo manifold, 550cc injectors, walbro 255, fmic, and tuning. it makes 375 at less boost than a 4g63 would also. the 4g63 has its advantages when it comes to boost but its not in the arena of making 300-400 on stock internals. Now when you want to step into the realm of making over 600hp it is much cheaper to make the 4g63 get there as it is turbo ready block from the factory, the gsr block...ehhh not so much....