O2 sensors?

[OR VietVet]

More Information for WALKER 50490

This pic does not show a separate pipe.

They show one of the cats connecting to the "Y" section between the piping at front of muffler to the back of the D/S cat but I see no separate pipe.

The supplied pic shows as one piece but other manufacturers show a 2 piece set up.

 

[tekfire07]

Here is the Walker brake down.

Exhaust Parts Lookup | Walker Exhaust Systems

Use the convenient Walker online parts lookup tool to find the exact Walker exhaust parts that match your next repair need.

www.walkerexhaust.com

This the part I am referring to.

WALKER 52541 Pipe / Resonator | RockAuto

RockAuto ships auto parts and body parts from over 300 manufacturers to customers' doors worldwide, all at warehouse prices. Easy to use parts catalog.

www.rockauto.com

Erik

 

[swathdiver]

More Information for WALKER 50490

This pic does not show a separate pipe.

They show one of the cats connecting to the "Y" section between the piping at front of muffler to the back of the D/S cat but I see no separate pipe.

The supplied pic shows as one piece but other manufacturers show a 2 piece set up.

Stock and that replacement from Walker are indeed 1 piece designs. My Magnaflow is 2-piece and has much better piping that flows better by itself.

 

[swathdiver]

I got the P0420 code. I tried a cat cleaner it worked short term. But the code came back. From research it seems that cat replacement is what will fix the problem. Because of finances I am looking a Walker OE direct replacement bolt on cats. I am considering replacing the system completely all new. The one thing that I can't find anyone have in stock is exhaust extension pipe that goes between the cat pipe and the muffler. I thought about doing only the O2 sensors. But I don't want to mess them up if the cats need to be replaced. Any input is appreciated.
Erik

New O2 sensors are not going to cure a P0420 if that's what you're thinking. You can replace the Y-pipe (with cats) without replacing your stock exhaust behind it.

 

[OR VietVet]

Ok, I was looking for a "pipe only" and not a pipe/resonator. I am old. You have to be specific.

Example of this is the way I missed the vehicle info in your first post.

 

[tekfire07]

Ok, I was looking for a "pipe only" and not a pipe/resonator. I am old. You have to be specific.

Example of this is the way I missed the vehicle info in your first post.

Good to know it is also known as a resonator. Walker just calls it a extension pipe. This is my first Tahoe. So I am learning on the fly. I appreciate your help and feed back.
Erik

 

[BG1988]

New O2 sensors are not going to cure a P0420 if that's what you're thinking. You can replace the Y-pipe (with cats) without replacing your stock exhaust behind it.

it cured a P0430 for me ( that is bank 2 as to P0420 which is bank 1) but i all ready tested the cat with AFM and DFCO off..

 

[tekfire07]

Stock and that replacement from Walker are indeed 1 piece designs. My Magnaflow is 2-piece and has much better piping that flows better by itself.

Are you running a complete Magnaflow system Cats and Exhaust? Have you noticed any improvements in HP or gas mileage?
Erik

 

[swathdiver]

Are you running a complete Magnaflow system Cats and Exhaust? Have you noticed any improvements in HP or gas mileage?
Erik

Well, after replacing the bad cat with a whole new Y-pipe my gas mileage certainly did get better. Since we were drag racing the truck, we did measure a 5 horsepower improvement as well. Not enough to feel but the mph in the quarter mile went up some.

Just the Y-pipe with the cats, still running the original exhaust behind it.