-- Remove The Cats Or The Muffler? --
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-- Remove The Cats Or The Muffler? --
I just got a si/do flowmaster 40 system on my 5.4 supercrew. It has stock cats and pipes up to the muffler inlet. The sound and tone is great but its just not loud enough. Ive been debating between 2 options and could use some help. Should I cut the cats off and just keep the si/do flowmaster. Or should I keep the cats and run a Y pipe where my muffler is now. Its pretty much between removing my cats or removing my muffler.
I want it too be louder but I like the deep sound of the flowmaster and I dont want it to just be rappy. What option would give a low throghty sound?
What option would flow better and would I still have enough backpressure to tow?
Also, will I have to do anything to retune the engine?
Any advice is appreciated
I want it too be louder but I like the deep sound of the flowmaster and I dont want it to just be rappy. What option would give a low throghty sound?
What option would flow better and would I still have enough backpressure to tow?
Also, will I have to do anything to retune the engine?
Any advice is appreciated
Postmaster
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From: Pleasant Hill, MO
As long as you're not in an emmisions happy state, I'd rip the cats off. They tend to cut out more sound anyway. They're more restrictive too... You'll be hearing the sound of a pure flowmaster 40 series. That'll be pretty cool. Anyway, take off the cat.
Ryan
Ryan
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From: Rio Rancho USA
Newer cats are not as restrictive as most people think. They are there for a reason too. If nothing else, get some high flow cats, they will let more sound out and you will be legal. Remember, emissions laws are at the federal level too, not just local.
Backpressure is bad. Any restriction will hurt towing ability, and thats all backpressure is.
Backpressure is bad. Any restriction will hurt towing ability, and thats all backpressure is.
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Thanks for all of the advice guys. I called up the local exhaust shop today and the guy wants 360 to put highflow cats in. I thought that was ridiculous so If I did anything with the cats, It would be taking them out. If I end up taking them out would I ahve to get an 02 simulator? Some friends that Ive talked to have been telling me to leave the cats and get rid of the muffler but from what im hearing on here I think I might just get rid of the cats.
Its Comin Right for us!
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From: GA
hi flow cats really dont flow a whole lot more than stockers....if you dump the cats you will have to get an o2 simulator
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Im pretty much set on taking my cats off next week. I am still wondering why people say they loose some low end power when they do this. And when I get a CAI will I have to retune the engine to adjust for all the air?
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Joined: Sep 2004
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From: Indiana
ive got the 99 4.6 and there are secondary sensors after the cats that determine whether or not they are doing their job. If you get a tuner you can disable those. Im not sure what will happen if you dont have them, might just give you a check engine light. The four cats on my truck are a BIG pain to eliminate (dont think you can just chop them off and put a pipe in their place, so getting an aftermarket Y-pipe would definately be easier.
Postmaster
Joined: Jun 2004
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From: Pleasant Hill, MO
Well, the computer will start trying to 'adjust' the way the engine is working to fix the problem it sees in the HEGO sensor. You have to get one that sends back a phoney voltage, to simulate proper operation.
Ryan
Ryan
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From: Fort Payne, Alabama
Originally Posted by kens64
Newer cats are not as restrictive as most people think. They are there for a reason too. If nothing else, get some high flow cats, they will let more sound out and you will be legal. Remember, emissions laws are at the federal level too, not just local.
Backpressure is bad. Any restriction will hurt towing ability, and thats all backpressure is.
Backpressure is bad. Any restriction will hurt towing ability, and thats all backpressure is.
Last edited by Mr. Man; May 3, 2006 at 10:41 PM.
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Proper flow rates are always good. Scavenging helps pull exhaust out of your engine.
Too much flow is also bad, that's why you lose low-end: you lose the scavenging affect.
This is different from backpressure, which is always bad.
Too much flow is also bad, that's why you lose low-end: you lose the scavenging affect.
This is different from backpressure, which is always bad.
Postmaster
Joined: May 2003
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From: E.Lincoln County, NC
Originally Posted by ChevmaninaFord
Where can you get one of these 02 simulators?