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Just bought 01 4d LX drove it three days then a check engine light. PO420 code I replaced both O2 sensors, new spark plugs, ran some injector cleaner, the last tank of fuel 40 MPG of mostly high driving. So my question is what is my best options for a new cat so that I can get this car through emisions.

 
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since your cat is in the header its going to be very expensive to replace you could use a angled o2 simulater in the meantime till you can save up for one or have exhaust shop weld a universal cat on and new bung hole and get extended o2 sensor wires.

 
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I found a magnaflow on line, they said it is a direct fit. Has anyone tried one of these and how well do they work

 
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is that for an ex or lx/dx, ex's have their cat under the car opposed to the lx/dx where it is built onto the exhaust manifold

 
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LX it is part of the manifold.