to OP, i think most folks who do these insane mods like TT kit cranking crazy numbers just have boat-loads of money laying around and like others have said, this is one of their many cars and they just truly love this car. from a pure enthusiast standpoint, it would be so cool to have a 700hp monster 370z. but from a practical standpoint, if i had enough money to build a 700hp Z, i'd probably end up buying another car.
loans for mods i think is a huge financial plunder. paying ridiculous interest for a personal loan on mods that would only cause your car to depreciate just doesn't make sense. and then if you ever do decide to sell the car, you gotta go through the hassle of parting it out and whatnot. i don't even wanna pay interest on my six figure worth of student student loans, and that's suppose to be a good investment, let alone for car mods