Yes, LFS has a built-in (but undocumented) bypass. Go to "Options" > "Misc" and type openconfig (no quotes). This instantly unlocks all car tuning options but does not give you the cars themselves. You still need to buy them with coins.
Always verify the hash of the downloaded file using a tool like CertUtil in Windows Command Prompt. A clean file will have a consistent MD5 checksum posted by the original author. Live For Speed 100 Save Game Download
All S1, S2, or S3 licensed content (depending on your account level) is ready to go. Gold Standard: All training exercises completed with Gold ranks. Custom Setups: Yes, LFS has a built-in (but undocumented) bypass