The Cadillac Cien, won from Umbria Rally Easy, is capable of dominating the early and mid-game in Gran Turismo 4 when tuned and driven correctly. This video goes through everything you need to know to explore the Cien's potential, from tuning its suspension, gears and LSD, to how to maximize its cornering performance.
Tuning Settings: https://docs.google.com/document/d/1ClCpRVUgQrDWdh-e78sgTnxZbvdxWgrRWDcuYcg-U_8/edit#heading=h.11ok4pg7gg38
GT4 SpecDB Summary Spreadsheet: https://docs.google.com/spreadsheets/d/1DtAPfe5YhuQ4p1mdoPcVAMF5NzzpZ7Jb0Q0gUpl1sEQ/edit?gid=362094050#gid=362094050
Gran Turismo's "Gear Trick" Explained: https://www.youtube.com/watch?v=4UT37-b3g-w
"The Forgotten Broken Car Of Gran Turismo 4" Opera S2000 Video by Yellowbird: https://www.youtube.com/watch?v=84cIv481PUs
Engine curve chart generated using GT4EngineGrapher by MF42-DZH: https://github.com/MF42-DZH/GT4EngineGrapher
All footage (except PAL-specific footage) is the NTSC-U version of Gran Turismo 4 played using PCSX2 1.7 nightly. I used Silentwarrior112's GT4 HD HUD and UI retexture pack, which can be found here: https://www.gtplanet.net/forum/threads/gt4-hd-hud-and-user-interface-texture-pack-for-pcsx2.417873/
Music used:
Sunday - Taroma Koshida
River of Samsara - Shoji Meguro (from Shin Megami Tensei: Digital Devil Saga)
Fiorenzo - Seigen Tokuzawa
Field - Twice A Man (from Kula World)
Callista - Saki Kaskas (from NFS IV: High Stakes)
World of Shadows- Ryota Kozuka (from Shin Megami Tensei V)
Limited Slip - Ekstrak (from Need for Speed Carbon)
Hiro - Twice A Man (from Kula World)
Quiet Curves - Hiroshi Okubo (from Ridge Racer Type 4)
Awakening - Tetsukazu Nakanishi (from Ridge Racer 7)
Cygnus Rift - Rom di Prisco (from NFS IV: High Stakes)