If you prefer to use your own profile, you can achieve similar results using Official PC Cheats or community mods:
Unlocking cars like the legendary 350Z, the RX-7, or the secret 1967 Camaro requires hours of slogging through URL races, Sponsor events, and Outrun challenges. Not everyone has 20+ hours to spend just to test drive a Skyline.
"You need to earn the right to drive the Skyline. The magazine covers are a core memory."
: Most downloaded saves provide a massive bank balance (e.g., $99,999,999) to build and tune multiple "show cars" without financial constraints. How to Install a Save Game (PC)