Say I wanted to take off my cat for some reason. Could I replace it with just piping and put the 02 sensors in the pipe without messing up the computer.
ive heard that it will mess up the computer.. what i want to do is remove my cat and buy an o2 simulator.. my buddy doesnt have the cat or muffler and its a single pipe out the passenger side and it sounds so mean when your riding next to him.. in my opinon i love that true straight pipe noise :rck:
If you are willing to spend the money on a O2 sim, spend $80 and get a high flow cat.
Still flows more than enough for your application and keeps you legal.
The high flow cat doesn't really muffler the sound at all, you can see straight through it.
If you're after obnoxious sound, then get a set of headers. :tup:
You also will not get a cell with the high flow cat.
you could try to gut the cat. I have a magnaflow and I love it but I kind of wish it was gutted. My brother wants to gut his stocker in addition to the straight pipe he already has. I'd like to see how that would sound.
I gutted my cat and cut my flowmaster muffler off myself and i got a headache on the way to the muffler shop! lol I had a dynomax bullet welded up (straight through 3") with a turn down and it sounds GREAT without the cat! Even though it is straight through, it does muffle the noise a little but mostly just gives it a really aggressive throaty sound instead of that straight poppy crap i had on the way to the shop. lol
:soapbox:
why does everyone equate chopping/gutting/removing the cat converter to more power & better sound?
If / when I have the time I will dyno mine with magnaflow cat & without just to have numbers to back up the fact that running a N/A motor without a cat causes loss of low end and doesn't make more power than running it with a highflow cat.
The high flow cat is straight through, as in you can see through it, and it still passes emissions.
I gutted the cat on my first truck and on my buddies RX-7. The RX-7 did better because it was forced induction (turbo).
My truck lost a lot of low end and gained some high end...but mostly it was just louder.
If you're wanting sound, spend the extra $$$ and get it done right.
I said this before, and I will say this again. NEVER GUT YOUR CAT... A gutted cat produces 30 times the emissions as a truck with a cat. Just go with a Magnaflow high flow cat, that will perform good and won't F*** up the environment.
I said this before, and I will say this again. NEVER GUT YOUR CAT... A gutted cat produces 30 times the emissions as a truck with a cat. Just go with a Magnaflow high flow cat, that will perform good and won't F*** up the environment.
Gutting a cat screws up optimal exhaust flow. You have a tornado effect inside the cat that will push air back into the lower header. Back pressure keeps valves from burning up on OHC motors, but when it isn't a constant flow, it makes everything run poorly. You remember the Eddie Murphy movie with the banana in the tail pipe. It's not just low end torque, it's that dizzy feeling at the stop light. 02 sensors that don't read right tell make for a computer that can't tell how rich to run the fuel, so you get some awful gunk building up everywhere else. The high-performance way is not that expensive in the long run.
I live in a state of 500,000 people we're not real worried about emissions and have no testing I just want it loud as possible I don't have the sound I want with just a y pipe. The stock cat makes a huge difference in sound and I want to know if it will screw things up.
As far as back pressure I drove a 98 true dual ram no cats and it beat another Ram with y pipe and magnaflow cat top to bottum. 170k on engine and he had no codes or valve issues.
Friend did it and noticed a power increase and loves the sound. Im doing it when I putt my headers on. I grew up in 70s/60s cars that had no cats. I couldnt care less about emissions, and if you think your gonna lose any power at all by gutting the cat, better think again….
Friend did it and noticed a power increase and loves the sound. Im doing it when I putt my headers on. I grew up in 70s/60s cars that had no cats. I couldnt care less about emissions, and if you think your gonna lose any power at all by gutting the cat, better think again….
But if your cat is the only thing providing back pressure then your gonna kill power. And i know you couldn't care about emissions but its only a matter of time until your state is like MASS and you get smogged every year and modified exhausts are illegal.
But if your cat is the only thing providing back pressure then your gonna kill power. And i know you couldn't care about emissions but its only a matter of time until your state is like MASS and you get smogged every year and modified exhausts are illegal.
Stock exhaust manifolds make enough backpressure, and does he have large custom dual pipes? If not hes got enough backpressure. This theory has been tested so many times by different people and the outcome is that the cat is the worst thing on these trucks.
If he doesnt have long tube headers with true dual 2.5" exhaust pipes he will gain power, and the engine will run more efficiently period.
I would personally add a glass pack but if he likes the sound more power to him.
But if your cat is the only thing providing back pressure then your gonna kill power. And i know you couldn't care about emissions but its only a matter of time until your state is like MASS and you get smogged every year and modified exhausts are illegal.
:huh: Thats news to me. Did it change in the last 6 months? I've been running a custom exhaust on my car for years now and it still only gets tested every other year. Even my truck only gets tested every other year. Safety is every year, emissions every other. And they don't sniff the truck (since its OBDII), they only sniff the car.
I grew tired of the novelty of having the loud LOUD exuast and put a glasspack on it, and it sounds great.
It took about 2 months for my engine light to come on, when it did, I bought a cheap little gizmo off ebay for 12 USD to fix the engine light.(**** spending 80 bucks on a simulator.) Its a metal spacer, not sure how it works, but it works.
If any of you are wondering about it, just go on ebay and search o2 simulator and it should come up.
(Not my product, just putting it out there cause its tried and true, from my personal experience, so no ones confused.)
Went to the muffler shop and talked to the guy that owns it. He said there was a guy that came in with 3 rams up to 01 and was dyno testing them. They lost up to 25 hp with the cat taken off. He said it was due to computer issues and you need the computer reprogrammed to get BACK the power and mileage also decreases.
so get your computer reprogrammed if he knows that you need to do that then he should know someone that can do it for you. and i just cut my muff. out to get better sound till i get my stacks which il run true straight to me (no Y pipe) from the headers
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