it could be repairable but you won't know until it's apart. I can't even tell you for sure that this is your problem, but it's suspect. For $1300, most times it comes down to dollar justification versus the vehicle.
WAIT a minute, have you checked your power steering belt?
Check it good. Check the tension and condition. You might actually just have a loose or deteriorated belt that may be slipping under load and therefore the pump looses pressure for a minute and then catches back up.
As far as the rattle goes, get a rubber mallet and whack the center of the cat several times listening for a rattle. If you hear something loose, then that's your problem. There is a chance that the reason you haven't heard it lately is because the pieces have wedged themselve within the case and aren't "loose".
STETT Performance -
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Plano, TX 75074
OEM Repairs and Maintenance
Extended Warranty Service
Everything Performance (brakes, turbos, Nitrous, Cams, Complete Engines, Clutches/Flywheels etc)
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