Removing the Cat...
Hotshot
Joined: Jun 2003
Posts: 12,338
Likes: 4,349
From: SW VA
It will give you some power increase due to the free-er flowing exhaust...but I doubt you will be able to notice it in the seat of your pants, unless you go with a full exhaust system (headers back).
Post Fiend
Joined: Jun 2005
Posts: 7,047
Likes: 2
From: North west La
You will need some simulators to replace your rear O2sensers. The truck will throw a check engine light without the sims. I doubt you will notice much difference with just removing the cats. Add headers , freeflowing mufflers & a tuner if you want more power
Posting Guru
Joined: Jan 2003
Posts: 1,719
Likes: 1
From: PA
Originally Posted by lariat97
You will need some simulators to replace your rear O2sensers. The truck will throw a check engine light without the sims. I doubt you will notice much difference with just removing the cats. Add headers , freeflowing mufflers & a tuner if you want more power
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Senior User
Joined: Jan 2005
Posts: 156
Likes: 1
From: Colorado
Originally Posted by 92f150I6
Superduties don't have rear O2 sensors. They are not required to have them, as their GVWR is too high.
FTE Leadership Emeritus
Joined: Jul 2002
Posts: 42,561
Likes: 421
From: Long Island USA
Originally Posted by LxMan1
All OBD-II vehicles have o2 sensors behind the cats.
My '01 V10 doesn't have a third O2 sensor. And, it's a CA emissions package, so go figure.
Look underneath. Any O2 sensors after the cat? You need a simulator or re-tune. No O2 sensors after the cat? Nothing special needed.
That's about the only way to decide if you need to fudge it or not.
Now back to the problem at hand: Why remove the cat? So you can get pulled over by DOT on the highway and get fined for it? Better yet, state troopers are being trained to check for emissions devices nowadays.
Even if your state doesn't do any smog checks or visual checks, you can get nailed by the DOT or state police (or the locals even ...).
I won't even go into my personal views on this...
But if you do remove it, you assume the risks too
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Senior User
Joined: Jan 2004
Posts: 232
Likes: 0
From: Gray's Creek, NC
What are simulators? Was thinking about taking the cats off of my 99 f-150... and where can you get them?
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