Replacement catalytic converter for 2000 Tundra V6 manual 4WD SR5

Apparently my 2000 Tundra V6 manual 4WD SR5 is not very common. I realized that my 'direct replacement' DAVICO 48165 catalytic converter was the wrong filament when I went to replace it today. There are 2 pipes from the manifold on the stock cat; the DAVICO 48165 only has one (picture).

After striking out with parts and fighting broken studs, I need some help. Can someone recommend a good aftermarket cat replacement that fits this truck? I am also replacing the mid pipe (DAVICO 17434) and muffler (DYNOMAX 19330 kit). ideally the cat will be compatible with the DAVICO 17434 and DYNOMAX 19330 but I'd also replace it all if someone has had success with another setup.

Is there a good aftermarket cat+ back cat for this truck? VIN 5TBBN4417YS066146

 

These trucks, at least for the V8, hate aftermarket cats. Not sure on the v6. Constantly popping codes, with exception of, like, 3 brands.

Why are you replacing the cat, if I may ask?

Do you already have the OEM replacement part number?

If not, have you gone to Summit Racing and searched?

If you do, did you plug the OEM part number in at RockAuto to get the available matches?

 

Maybe a muffler shop could help. They weld different parts together.

 

The O2 sensors were on their way out, so I figured it was time to replace the exhaust system while I'm at it. It looked ratty, but now that I have it out it looks like mostly surface rust. I do not think the cats are bad. I was going to keep them as backup after replacing with aftermarket. Now I'm thinking I'll keep them (front and intermediate pipe), clean them up, and put them back. I do not think there are aftermarket replacements.

The Toyota front pipe (17401-07050) is available new at $1,700. It looks like there are no aftermarket options (also searched RockAuto and Summit Racing).

The intermediate pipe (17403-07030) is discontinued and it looks like there're no aftermarket options (also searched RockAuto and Summit Racing).

The Dynomax muffler kit appears to fit (19330), so I plan to install it.

What do you mean these trucks hate aftermarket cats? Do the originals tend to last 20+ years?

I'm planning to remove the surface rust on the front and intermediate pipes and protect them with high temp. paint. I am also going to try to separate the front and intermediate pipes and replace the bolts with OEM spring loaded. Attached are pictures of the current state. Install new sensors, of course.

I'm open to suggests on what to do before replacing the front and intermediate pipes while I have them out. Should I leave them connected, or attempt a refresh with new hardware? I may also do a smoke test to check for leaks.

 

Most of what you want to know is in here. I realize it's a lot to read, so I'll highlight this part, taken from years and years of collective knowledge and experience on this forum:

• Cat inefficiency codes P0420 and P0430: Strong chance it's not your cats. Read why HERE.
• Beware aftermarket cats: Especially ones that are not specifically CARB-compliant. Members over the years experienced recurring cases of check engine lights after installing aftermarket cats (i.e. cat inefficiency codes P0420 / P0430, see bullet above!). If you cannot afford OEM cats, or they're NLA for your 1st gen Tundra, some brands members reported working w/o throwing codes are: Walker, Magnaflow, and Summit Racing's house brand. Really, the best way to diminish risk of throwing codes with new cats is: Choose a CARB compliant product, use a brand others found to work, DO NOT use 'generic fit' products, ensure all flanges and O2 sensors are fully tight with gaskets (where required), and don't trust your local exhaust shop to know about these quirks.

The bit about consantly throwing check engine lights with aftermarket cats is not an exaggeration. If you search back through and really dig, you'll probably find at least a couple dozen people who're suffering from them. At least one of the recent ones trusted their muffler shop to weld in a generic cat, and, lo and behold, check engine lights. I've been waiting on an update to see if the shop owned up and resolved the issue.

Look, if you can manage to get the OEM studs out, clean up the surfaces, and replace gaskets where they belong, if you've got it out anyway, I'd do it.

I pulled a random VIN for a 200 Tundra SR5 V6 and stuffed that into the EPC, and came up with the following exploded - note, you can click on ANY number in the linked picture here, and get the part.

Also of interest, per that EPC exploded, it would appear the new cat you received is for the "California spec" (i.e. lower-emissions) version of the truck, which is OEM part number 17401-07040. You are correct in your part number of 17401-07050, and it's also NLA.

Magnaflow has quite a few products for the single-opening CARB compliant Cali trucks here: https://www.magnaflow.com/collections/2000-toyota-tundra-catalytic-converters?california=true

For the non-Cali compliant/federally OK stuff, there's this page, strangely, I looked at the cat here and it's also a single-opening? Maybe it's just a generic stock image?: https://www.magnaflow.com/collections/2000-toyota-tundra-catalytic-converters

Anyway, if the old are fine, I'd keep. Also note, one or more of those O2 sensors call for gaskets.