Can You Use Career Cars in Need for Speed ProStreet Multiplayer (PS2)? No—Saves Are Separated

No. Career mode and Multiplayer mode use separate save files and car pools on PS2. Your tuned Career cars do not carry over.

Why They're Separate

• Balance: Multiplayer offers a fixed roster so all players have equal access—no "maxed-out car vs. stock car" mismatch.
• Progression Isolation: Career unlocks (parts, cars, cash, visual upgrades) are deliberately firewalled from Multiplayer.
• Technical Limitation: PS2 memory card saves are mode-segregated. The game reads different save blocks for each mode.

How Multiplayer Car Selection Works

1. Select "Multiplayer" from main menu.
2. Choose mode: Quick Race, Ranked, LAN/Online (if server active—GameSpy dead, private servers rare).
3. Pick from the Multiplayer-available car list (subset of full roster, pre-tuned to tiers).
4. Race.

What You Can Do

• Build a Multiplayer garage from the provided selection.
• Practice with Multiplayer cars in Quick Race to learn their handling.
• Accept that Career progression = single-player only.

This was standard for PS2-era racing games (Most Wanted, Carbon, ProStreet, Undercover all separate Career/MP). No workaround exists on original hardware.