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A lot of aftermarket catalytic converters are not made to fit your application and are left plain to keep the cost down. If you get one of these you will probably have to cut the pipe from the old unit and weld it onto the new one to make it fit the vehicle as well as any hangers or extra shields that may be used on the vehicle. If that sounds like more than you want to get into make sure that your search is for made to fit versions. There are several different companies that make them so shopping around will still usually save you a good bit of cash. Hope this helps.
Unfortunately aftermarket parts are not always the way to go with catalytic converters. I’ve seen new aftermarket converters set P0420’s right out of the box. Quality is key here so if you go aftermarket be sure to find quality parts which may run as much as OE.
Update!!
I know this is a common problem with the Nissan Altimas so I want to share info on my experience. I ordered a Walker #16403 precat on ebay for my 05 altima 2.5. After all the labor of pulling the original precat I found out that the Walker (comes with 2 o2 sensor holes and plugs to fill them and you must reuse original heat sheilds)unit flange that bolts to the exhaust pipe did not line up. Luckily the ebay seller let me return the unit even though it was outside the 30 day window. I then ordered a Dorman 674-959 on ebay, after learning my lesson from the first one I prefit the unit to make sure the exhaust flange lined up and it did—yay. Only to find out when I bolted up the rear heat shield (between the precat and engine) it held the exhaust flange that bolts to the motor at an angle to where it wouldnt seal ( 3/8″ gap) so I had to “persuade” the supplied rear heat shield with a hammer. The Dorman unit however also came with 2 o2 sensor holes but no plugs to fill the un-needed hole so the awsome counter guy at Autozone led me to a oil drain pan bolt assortment pack where I was able to find a drain bolt with the right threads and a copper gasket that I was able to file to fit the bolt to seal 1 of the 2 holes in the precat. I hope this helps at least 1 person with a p0420 code on an Altima, so far 4 months and no ses light on the instrument cluster banana:this happend to me recently — the bolt that attaches the bottom of the aftermarket pre-cat to the engine bracket botton would not line up once getting the exhaust manifold lined up and near tight. It connected fine to the rest of the exhaust pipe so I left it as is.
Is this going to break the car if i leave it that way? I’m only planning on keeping it another year.pre-cat that I bought: http://www.ebay.com/itm/252162071816?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT
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“Only to find out when I bolted up the rear heat shield (between the precat and engine) it held the exhaust flange that bolts to the motor at an angle to where it wouldnt seal ( 3/8” gap) so I had to “persuade” the supplied rear heat shield with a hammer.”
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