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2002 Silverado 1500 4x4 Catalytic Converter & Pipe

gtmatt

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gtmatt New Member

gtmatt

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I'm trying to replace both catalytic converters on my 2002 Silverado 1500 4x4. I bought a direct fit assembly (with Y pipe) that is supposed to bolt on to the manifold side (two places) and the muffler side. Problem is, the pieces didn't fit right -- the pipe from the driver's side converter hit the front driveshaft when trying to install, so I took it back. I can't find anything online about having different parts for this for a 2wd versus 4wd. The part I had was a Bosal. The Walker and Magnaflow parts look almost exactly the same, but it is hard to tell the angles of the pipes, etc. from looking at a photo.

 

Has anyone done this replacement on a 4x4 like mine and can tell me what brand/model they used? I don't want to keep ordering $400+ parts and returning them because they don't fit. Thanks.

redvett Senior Enthusiast

redvett

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Frame is different on a 4x4 so the entire exhaust system is different from a 4x2. Order 4x4 exhaust for your truck and it will fit.

gtmatt New Member

gtmatt

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Frame is different on a 4x4 so the entire exhaust system is different from a 4x2. Order 4x4 exhaust for your truck and it will fit.

Places such as Advance Auto and Autozone come up with the same part numbers whether it's 4x2 or 4x4. The couple of manufacturer's websites I've looked at don't make any distinction either. I don't want to pay a huge markup to get one from a Chevy dealer if possible. Where else is there to look?

owenbyc Enthusiast

owenbyc

Posted
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Hey i had a 2000 4 x4 and now a 03 4x4. Both trucks i cut the cats off. The 2000 at first i put hi flow convertors on. Way way cheaper then stock ones plus more airflow. The o2s are easy to fool

nickvrebel Senior Enthusiast

nickvrebel

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I know the Magnaflow will fit the 2001 trucks, a friend has to swap his.

 

the 4X4 is a little more picky about clearance, any y pipe that fits a 4x4 will also fit a 2wd, but not necessarily the other way around. This was a problem for some people installing long tube headers for a whole on 4wd trucks. now all models I've seen recently will fit either.

FargoZ71 Enthusiast

FargoZ71

Posted
Posted

Call up Magnaflow, thats what I have on my truck, cant tell you the difference, but auto parts guys are usually just there for the money and are weekend warriors on there own rigs. Not necessarily guru's or experts, so but your $ in the hands of the ones who build them.

gtmatt New Member

gtmatt

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Finally got it fixed. The second one I ordered was a Maremont, and it did fit just fine. There was a problem, though, because part of the weld inside the pipe by one of the oxygen sensor ports protruded into where the oxygen sensor would be when screwed in. Poor quality control. I was able to drill it out, but only after removing the whole assembly again (a pain). Hopefully this is helpful info for someone else down the road.

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