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05 OB had P0420 at 105K until I junked the car with 200K miles. Tried replacing the cat (aftermarket) without change except more change out of my pocket. Computer is tuned real tight for emissions. It may clear itself but will come back. I bought a $20 code reader/eraser so I could pass our testing every two years. Clear code, ru at a partiocular sequence to set system checks as ready then run to get emissions test good for 2 more years. I think I did that for the last 8-10 years of ownership. Put a piece of black tape over the light Costs nothing. If recent purchase, prior owner probably knew the tricks.

actually, crap axles can, will, and have caused symptoms like this... and as for it not happening right away.. i can see that happening with crap axles... chilly at night, grease in the joints gets stiff... initial driving the grease is still stiff so joints are not sloppy, but slowly warms up, allowing any excess movement in the joints to become noticeable. makes perfect sense to someone that has had it happen. bad tires (out of round) is possible, but i dont see that not showing right away... definitely have bushings, tie rod ends, etc looked at.. and yeah.. have the mechanic show you specifically what the problem is before having things replaced.

Aisin is the way to go if you want a "kit". I use Mitsuboshi belts, NSK or Koyo bearings, and an Aisin tensioner. Requires more homework to find all the right part numbers (I usually look up OEM # by VIN, and cross reference from there), and sometimes ordering from multiple sources (I've been using CarID for the last few sets, but I think I've gotten the tensioner from RockAuto). Don't think I've bought a water pump in 10 years or more...

I've heard of people machining/redrilling the stock hubs to 4x100. That's probably your best bet, if that's the size you want. It gets difficult as it begins to clash with the bosses for the rotor mounting bolts. You're currently running a 7" wide wheel with 4.5" of backspacing (meaning 1" of negative offset!), yea, that's not going to fit well. A stock Toyota or Nissan 6" wide wheel will fit much better. It is certainly possible to have new hubs made, but my understanding is cutting the splines is extremely expensive. Someone had a run of 5 lug rear hubs made not too long ago. They were manufactured overseas in large-ish quantities, and they were still spendy. I suspect having 2 pairs made (they are different front and rear) will be many many thousands of dollars.

I don't know why I didn't see the vehicle application to this part number before on Amazon. It's literally right there. Haha thanks buddy

Oh, for Fuchs sake.

Look for some 15x6 wheels with about 0.5 to 1 inch of offset(3.5-4" backspacing). Those fit my ea82 wagon like a glove, running 175/55R15, the tires are the exact same size as the stock 175/70R13's.

When there’s confusion check with manufacturer. AISIN says: TKF010 https://aisinaftermarket.com/english/onlineparts.html

Have you tried http://jdmfsm.info/Auto/Japan/Subaru/Impreza/1998/ ?