Wanting to replace cats and y-pipe...

[Halen5150]

Something is rattling inside of my y-pipe, and I'd like to go ahead and just replace the cats also. The muffler shop quoted me about $650 for parts and labor, but they said it was about the same parts as a stock setup. I want high-flow cats though. Are there any high-flow cats that have the O2 sensors included? I need the whole setup between the manifold and the flanged connection after the cats. This is on an '00 5.3 x-cab Z-71. Thanks for the help.

[snoman]

Something is rattling inside of my y-pipe, and I'd like to go ahead and just replace the cats also.  The muffler shop quoted me about $650 for parts and labor, but they said it was about the same parts as a stock setup.  I want high-flow cats though.  Are there any high-flow cats that have the O2 sensors included?  I need the whole setup between the manifold and the flanged connection after the cats.  This is on an '00 5.3 x-cab Z-71.  Thanks for the help.

 

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High flow CATS are more a state of mind that a benifit with that engine and setup. The 5.3 flow pretty good from the factory and if you change too much you could actually see a decrease in performance on a closed loop engine. They are not like 60's and 70's carbed engines. They respond differently. If you super charge it, Hi Flow might help but otherwise money is better spent elsewhere.

[jt1872001]

ya buy headers

[snoman]

ya buy headers

 

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Yes I agree you would get more bang for your buck there by balancing the exhaust flow from each cylinder.

[cedjunior]

If you go with headers, you'll have to go with midlength or long tube because shortie headers wont give you any gains. The exhaust manifold on those gen3 engines flow about as well as shorty headers. The stock cats flow pretty good, probably just as well as a high flow cat. I think that rattling you hear in the y-pipe might be the guts of one of the cats rattling around. I just had to replace the y-pipe/cat on my truck for that reason, though I've got over 200,000 miles.

[Halen5150]

I figured someone would tell me to buy headers. Thing is, the cats need to be replaced anyway, but if the high flows won't help, then I'll just get some stockers. $650 was the installed price for the cats and y-pipe. Headers will run me at least $600 or more + cats + y-pipe + labor.

[snoman]

I figured someone would tell me to buy headers.  Thing is, the cats need to be replaced anyway, but if the high flows won't help, then I'll just get some stockers.  $650 was the installed price for the cats and y-pipe.  Headers will run me at least $600 or more + cats + y-pipe + labor.

 

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Nah you could get some shorty headers for under $300 and put them on yourself and when you are if you replace everything new it is easy to put on yourself too to save on labor. The hard part is repairing old exhaust but all new is easy.

[cedjunior]

If you go with headers, you'll have to go with midlength or long tube because shortie headers wont give you any gains.  The exhaust manifold on those gen3 engines flow about as well as shorty headers. 

 

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[snoman]

If you go with headers, you'll have to go with midlength or long tube because shortie headers wont give you any gains.  The exhaust manifold on those gen3 engines flow about as well as shorty headers. 

 

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While it is true that they will not be tuned for low speed boost (which is not as critical with a tuned intake anyway) it will balance the backpresure on all cylinders while releaving it some and make a difference you will feel and allow you to use new stock pipes too if you want which other header will not and it will minimize the extra heat dumped into engine compartment that full header will dump big time.