Catalitic converters?
Thread Starter
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Post Fiend
Joined: Mar 2005
Posts: 8,542
Likes: 5
From: Louisiana
Catalitic converters?
My dad's about to get a 01 F-150 4x4 w/5.4, and one of the first things I'm going to get him to do is pipes. He doesn't want to loud, but free flowing.
How restrictive do you guys thing the cat.s would be on this truck, and if I took them off, would the sensors go crazy or would it be ok?
Also, I personally like glasspacks, but where or what kind of muffler could I get to be a good flowing, but cheap, and mild/loud muffler? 24" backwards glasspacks?
Also, what do you guys think of X or H pipe connections on true duals?
How restrictive do you guys thing the cat.s would be on this truck, and if I took them off, would the sensors go crazy or would it be ok?
Also, I personally like glasspacks, but where or what kind of muffler could I get to be a good flowing, but cheap, and mild/loud muffler? 24" backwards glasspacks?
Also, what do you guys think of X or H pipe connections on true duals?
Elder User
Joined: Jan 2006
Posts: 629
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IMHO the factory cats aren't that restrictive.
You'll get a CEL unless you getMIL eliminators or turn the rear 02 sensors off in a custom tune.
An x-pipe on duals is the way to go IMHO.
I'd just stick to the commonly available mufflers/cat-backs: Flowmaster, Magnaflow, etc. SpinTech sounds pretty good IMHO.
You'll get a CEL unless you getMIL eliminators or turn the rear 02 sensors off in a custom tune.
An x-pipe on duals is the way to go IMHO.
I'd just stick to the commonly available mufflers/cat-backs: Flowmaster, Magnaflow, etc. SpinTech sounds pretty good IMHO.
Thread Starter
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Post Fiend
Joined: Mar 2005
Posts: 8,542
Likes: 5
From: Louisiana
Ok, how many cats do the trucks have? I heard 4, but I only noticed 2.
Either way, I'll prolly keep 2, and put about 2.5" duals with a x pipe and some small magnaflow type mufflers.
Should sound and flow great.
Thanks for the advice.
Either way, I'll prolly keep 2, and put about 2.5" duals with a x pipe and some small magnaflow type mufflers.
Should sound and flow great.
Thanks for the advice.
Elder User
Joined: Jan 2006
Posts: 629
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Two pre-cats just after the manifolds, then two main cats under the truck.
I ditched my pre-cats, just run main cats. Passed CA smog, too.
2.25 in plenty big for duals on a naturally aspirated truck. You can go larger if you have a blower or turbo or otherwise need additional flow IMHO.
X-pipe = good!
I run two tiny Magnaflows on my dual setup. Too loud in the back of my truck for passengers, but it does sound pretty good.
I ditched my pre-cats, just run main cats. Passed CA smog, too.
2.25 in plenty big for duals on a naturally aspirated truck. You can go larger if you have a blower or turbo or otherwise need additional flow IMHO.
X-pipe = good!
I run two tiny Magnaflows on my dual setup. Too loud in the back of my truck for passengers, but it does sound pretty good.
Elder User
Joined: Jan 2006
Posts: 629
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I just gutted mine...take a hammer and lightly tap the outside of the cat. This will loosen the substrate inside, then just vacuum it out. This way you don't need to add a section of pipe or anything. And it still looks like you have the precats, so you'll never get into trouble for tampering with the cats.
In CA, they have a visual inpection so it's important to me that it looks like the cats are there.
In CA, they have a visual inpection so it's important to me that it looks like the cats are there.
Thread Starter
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Post Fiend
Joined: Mar 2005
Posts: 8,542
Likes: 5
From: Louisiana
Were I'm at, I get my local muffler shop to do the work, and he also does inspections, and tells everyone IF you have trouble inspecting it, I'll do it.
But either way, I could go with a truck with straight pipes, racking my pipes in the parking lot, and pull up, and they'd still inspect me, without even asking.
But either way, I could go with a truck with straight pipes, racking my pipes in the parking lot, and pull up, and they'd still inspect me, without even asking.
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Senior User
Joined: Sep 2004
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From: Fort Payne, Alabama
The 4 stock cats flow great....really, i was amazed when I saw them when I got mine taken off and put 2 high flows on. The ONLY thing the cats REALLY affect is sound, WOW, i gained a ton of decibals by switching to high flows, I love it to 
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