I had one of those flex fans with out a clutch and it was super loud and made a winning sound also felt like it was stealing a lot of power from the motor and cause the belt to slip. so I would use a clutch. I switched to dual electric fans with its own thermo switch set at 200 Plus a 2 row radiator. Also i upgraded my alt to a 140amp to help run the fans. Here is every thing needed to go back to stock not cheap.
Fan
http://store.driftmotion.com/static/...tefanblade.php
Fan clutch
http://store.driftmotion.com/static/i-7mfanclutch.php
Shroud
http://store.driftmotion.com/static/...supra86-92.php