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Before you proceed with any download, it is worth understanding what this version offers. Build 549 of Titanium 1.61 includes:

seems to be a specific release of the ECM Titanium software. Without more context, it's difficult to provide a direct download link, as software downloads often require official sources or subscriptions.

To download ECM Titanium 1.61 549 or any other version, I recommend:

For hobbyists, the combination of a (around $200) and free software like ECUFlash or RomRaider is a safe, proven path for many Subaru, Mitsubishi, and Toyota ECUs.