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cheapjeep 09-09-2012 06:58 PM

HO exhaust question
Do you HO guys have just the 2 cats in the y pipe or do you have the third one also? The reason I'm asking is because mine never had the 3rd cat. I don't believe it ever did as I'm the second owner and it didn't have a lot of miles on it when I got it and as far as I know the original exhaust. In the pics below you can see where the exhaust was welded together but that was cut there to remove the y pipe to change the oil pan. It was just straight pipe there. Also in the pic where the clamp is the pipes have the original locator tab and notch so I'm thinking the pipe from the y pipe to the muffler was original.

Frango100 09-09-2012 08:55 PM

Re: HO exhaust question
I think that there is no difference on the exhaust for the 4.7 and 4.7HO. Mine also only has the precats.

TJXJWJ 09-09-2012 09:18 PM

Re: HO exhaust question
Mine looks the same as yours...2 pre cats only.

hoffmanestates 09-09-2012 09:59 PM

I noticed you are missing resonator. Looks like a canister in pic #3

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cheapjeep 09-10-2012 12:26 AM

Re: HO exhaust question
That's weird the service manual shows the cat between the y pipe and muffler on all 4.7's(federal and Cali) and Stone has one on his:confused:

FlyinRyan 09-10-2012 12:32 AM

Re: HO exhaust question
Its a late 04 thing.

honda_fox3 09-10-2012 01:46 AM

Re: HO exhaust question
My 04 non ho looks the same

01grand 09-10-2012 01:30 PM

Re: HO exhaust question
I also have the 3rd cat, but mine is a 2001. I remember reading something about this before that agrees with what Ryan said, some time in 04 they deleted the 3rd cat, maybe all 04's?. I plan on taking mine out when I do my exhaust, on the 2001 the pipe is 2.5" up to the 3rd cat and goes to 2.25" after it, so if I cut it out I can easily do 2.5" the whole way back, for whatever that may be worth. Stonecold's is a 2000 I believe thats why he has all 3.

Trav1s 09-10-2012 03:05 PM

Re: HO exhaust question
My Columbia Edition built in October IIRC is like the picture above.

Ben_02WJ 09-10-2012 06:12 PM

Re: HO exhaust question
My 2002 HO has all three cats...

cheapjeep 09-10-2012 09:39 PM

Re: HO exhaust question
Thanks for all the input guys! The reason I am so curious about this is I'm seriously considering Stonecold's muffler delete and going to 3" the whole way from the y pipe to the bumper. I'm afraid it might be too loud with the 2 cat system.

hoffmanestates 09-11-2012 06:49 AM

So the canister looking.thing down stream.of.the small twin cats is a bigger cat? But no sensors? Then I guess I have this.also

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