Be extremely cautious. .rar files from unverified sources are common vectors for malware.

It is common for comprehensive "Solid Guides" for singing (like Singing Success or The Zen of Screaming ) to be shared in archived formats.

Always scan the file with a tool like VirusTotal before opening.

The term "singing" combined with a .rar extension often points to archived vocal courses or VST (Virtual Studio Technology) instruments.

Enthusiast communities like Rennlist and P-9 (Planet-9) often host comprehensive PDFs and DIY guides for 997 maintenance. You might find a file like 997_Engine_Guide.rar or similar on these forums.

A high-pitched "singing" or metallic whining can be a symptom of a failing IMS bearing, a well-known issue in M96/M97 engines.