Deceleration noise?

[jsad316]

Hi guys. I have a '92 s13 hatch with a black top sr20det. The car is nearly driving and then this happened. We can't identify what this obnoxious noise is. The turbo is not bad. I've been told it's not a spun bearing. It is the noise whenever I let off the throttle (yes that noise is not the bov). It sounds like it is coming from the rear of the engine. Any help and suggestions would be greatly appreciated. Please ignore the heat shield simply laying on the header and any other nuisances.

VIDEO (https://www.facebook.com/photo.php?v=658051854247908&l=8013402726958951117)

[OnTheChip]

Sounds kind of like an alternator, or other belt driven pulley, bearing.

[cotbu]

Loose flywheel bolts

[OnTheChip]

Timing chain tensioner?