no cats

[truegraw]

would the car run with all 4 cats cut off? i believe there stopped up. i know i can take the rear ones off but wondering if the fronts are stopped up. dont wanna spend $$ on new cats when i plan on headers eventually

[2,4shofast]

Not without a tune, even then I wouldn't recommend it. They have after market cats that are less restrictive and are priced reasonably. On a side note I is highly unlikely/impossible for all four cats to be "stopped up" and it still run.

[truegraw]

it had the liddo tune. defiantly gonna take the rears off but im worried the fronts are the bad ones. what about gutting the fronts and removing the backs?

[MOTOWN]

The car will run with no cats , and you do not need a tune.

[2,4shofast]

The car will run with no cats , and you do not need a tune.

Im sure the O2 sensors wont mind at all:rolleyes: So you can run a stock marauder with no cats and not get any CEL's?

[Pat]

Reading what you write about CATs I don't believe you understand the OBDII system and what part CATs play. (google OBDII)

The car's computer system uses the signals from the front CATs via the oxygen sensors to determine the air/fuel mix for each cylinder and combustion cycle. Disrupting the proper operation of this system is a Federal offense with fines ranging from $500.00 to $26,000. Go to your reputable exhaust shop and they will confirm this.

BTW CATs are warrantied to 80,000 miles on any car.

A decent muffler shop can test the CATs on the car. Bad CATs sometime rattle.

Replacing your exhaust manifolds with headers still requires CATs.

The Lideo tune merely disables the data reporting of the rear CATs to the cars computer so that enriching the air/fuel mix in other parts of the tune will not cause a CEL, IIRC.

[MOTOWN]

Im sure the O2 sensors wont mind at all:rolleyes: So you can run a stock marauder with no cats and not get any CEL's?

Yes you would get a cell until you add mil eliminators.

[2,4shofast]

Yes you would get a cell until you add mil eliminators.

I give up, proceed.

[Logizyme]

Your car will run the same as stock if you have removed/gutted cats. It will not effect air/fuel readings. It will set a CEL. You can disable the PCM from checking the performance of the cats in a tune which will prevent the CEL, but would still fail an emissions test. You can use some form of MIL eliminator to trick the PCM into thinking cats are present and functioning, and if you can prevent the MIL from illuminating in this way you could pass a plug-in only emissions test, but would not pass a tailpipe emissions test.

Physically you could remove the cat-pipes and visually inspect them for being clogged, if so you could hollow out the pipes of the catalyst substrate, or replace the pipes with a custom made pipe, however the cost of materials, and labor for a custom cat-delete pipe typically exceeds the cost of new aftermarket direct fit cat pipes.

[Bad_S55]

The Lideo tune merely disables the data reporting of the rear CATs to the cars computer so that enriching the air/fuel mix in other parts of the tune will not cause a CEL, IIRC.

The rear cats are not monitered at all, so those can be removed without any change to vehicle operation. I can tell you that from experience.

[truegraw]

so where is a good place to get a set of mil eliminator's for the MM?

[Marauderjack]

The exhaust will STINK and burn your eyes!!:eek:

There are no gains running without cats except a different sound and stench.....been there and done that...re-installed cats!!:beer:

[justbob]

The exhaust will STINK and burn your eyes!!:eek:



There are no gains running without cats except a different sound and stench.....been there and done that...re-installed cats!!:beer:


This^

I ran no cats for a year and couldn't tolerate the smell!

But yes, it will run just fine and yes, it will throw a code.


Builder Of Badassery

[truegraw]

cant get it done until Tuesday, if i get under there and beat the crap out of em will this help at all?

[Logizyme]

Very unlikely. If they are clogged(which is rare) it happened for one of the following reasons:

Excessive burned oil, coating and clogging the substrate with burnt residue.
Misfire, typically ignition caused, resulting in excessive oxygen and hydrocarbons entering the cats causing overheating and melting of the substrate.
physical damage, causing the substrate to become broken and dislodged, repositioning to an angle that prevents flow.

Why do you think you have clogged cats??

[Finally]

Just be prepared for a very loud barky exhaust note if you are running the stock exhaust I have all the cats removed on mine and it's too loud for this old man .

[JOEMERC]

I removed just the rear cats and its way louder , I'm running Cherry Bomb turbo mufflers its almost to loud now for me now should have left stock mufflers would have been perfect sound I'm sure. I noticed a little more power too ,than just a muffler change .

[JimP]

If you do remove the cats or hollow them out it will smell and it will throw a code p042, catalytic converter inefficiency. If you don't get a tune to turn off the monitors for the downstream 02 sensors you can prevent getting a code by installing "vibrant o2 spacers". They take the rear o2 out of the exhaust stream tricking the pcm and preventing a code.

After installing an after market catalytic converter on my daily driver, Impala I kept getting the code and engine light come on despite the car passing tail pipe emission testing. An o2 spacer solved the light coming on. Look up vibrant 02 spacers, they come in different configurations, its another option.

[justbob]

If you do remove the cats or hollow them out it will smell and it will throw a code p042, catalytic converter inefficiency. If you don't get a tune to turn off the monitors for the downstream 02 sensors you can prevent getting a code by installing "vibrant o2 spacers". They take the rear o2 out of the exhaust stream tricking the pcm and preventing a code.

After installing an after market catalytic converter on my daily driver, Impala I kept getting the code and engine light come on despite the car passing tail pipe emission testing. An o2 spacer solved the light coming on. Look up vibrant 02 spacers, they come in different configurations, its another option.


$20 EACH for a o2 spacer? LOL

Spark plug foulers come in 2 packs for like $4.

Same thread pattern..


Builder Of Badassery

[truegraw]

seems like the car is getting progressively worse, almost like im driving while dragging on the brake. i returned it to stock on the tune and had it throw these 3 codes p1000 p0316 p0306. would stopped up cats do this or am i looking at a way bigger problem?? what are Spark plug foulers used for?

[RubberCtyRauder]

p1000 is drive cycle not complete, monitors are not all ready. did you disconnect battery?
p0306 is misfire in cyl 6
p0316 is misfire detected in first 1000 revolutions.

Are you running 93 octane?

[truegraw]

no i did not disconnect the battery, but after getting that code should i? changed tune back to stock and drove 2 miles shut the car off and when i started it back up it had the check engine light on. came home read/cleared the codes and put tune back on

[justbob]

The tune probably had all cels turned off. When you loaded the stock tune it finally guided you to cyl 6.

Start there with your down on power thoughts and leave the cats alone. [emoji6]


Builder Of Badassery

[truegraw]

so which one would be cylinder 6? i can smell the stinking cat smell especially when i go wot. its not looking good, hope i didnt get burned on $6000. guess ill check all the compression this weekend

[JimP]

Cylinder 6 is second front the front on the driver's side of the engine. Remove the coil cover then the coil and have a look to see if there is any sign of water / coolant down there, then check the plug and report back.

[JimP]

$20 EACH for a o2 spacer? LOL

Spark plug foulers come in 2 packs for like $4.

Same thread pattern..


Builder Of Badassery

You have to drill out the spark plug foulers, it's a pain. They only come in one configuration, straight up and down.

For tight fits the Vibrant pieces come in either 45 or 90 degree configurations as well that's why I suggested those.

[justbob]

You have to drill out the spark plug foulers, it's a pain. They only come in one configuration, straight up and down.

For tight fits the Vibrant pieces come in either 45 or 90 degree configurations as well that's why I suggested those.


Certainly not bashing you, just the company for adding an inch and marking it up so much. I had drilled ones on my last set up. Wasn't bad, just another step. I didn't realize they made the offset style? I've only seen the straight.

You just get so used to custom making everything for this car that you tend to not even look around anymore..


Builder Of Badassery

[JimP]

Certainly not bashing you, just the company for adding an inch and marking it up so much. I had drilled ones on my last set up. Wasn't bad, just another step. I didn't realize they made the offset style? I've only seen the straight.

You just get so used to custom making everything for this car that you tend to not even look around anymore..


Builder Of Badassery

No worries, I knew you weren't. I just figured it would be easier for the original poster than having to explain drilling them out etc.... the 90 degree unit saved my bacon that's why I put it out there.

All good my brother.

[RubberCtyRauder]

I ask again..what octane are you running? be honest

[8UWITH6]

Reading this is nauseating.

Fix your #6 misfire.

[truegraw]

just checked the compression got around 150 in all except #6 and its around 60...... man this sucks!! do you guys have any tricks or tips on getting out of this without a major chunk of cash?? how long will the car run like this? if i change the burn plug on #6 will it help any?

[8UWITH6]

Sorry for the bad news. Put a plug in it for fun but you will probably still have a random misfire until its fixed.

[truegraw]

went ahead and took both sets of cats off because i figured the buildup from no6 had to ruin the driver side anyways, also stinking egg smell was getting worse. Omg that thing is stupid loud now under load!!! i cut just the back 2 off my 03 and it kept the low rumble this thing sounds like straight pipes!!! Now i got to get the head fixed because you can really hear the miss through the exhaust now

[Finally]

went ahead and took both sets of cats off because i figured the buildup from no6 had to ruin the driver side anyways, also stinking egg smell was getting worse. Omg that thing is stupid loud now under load!!! i cut just the back 2 off my 03 and it kept the low rumble this thing sounds like straight pipes!!! Now i got to get the head fixed because you can really hear the miss through the exhaust now

Yup real loud,when I put some other mufflers on I plan to cut open the factory mufflers just to see what the hell if anything is in them .

[truegraw]

whats a good set of mufflers to quiet it down because its way to loud, basically anything?

[O's Fan Rich]

[QUOTE=Pat;1474048]
BTW CATs are warrantied to 80,000 miles on any car.

A decent muffler shop can test the CATs on the car. Bad CATs sometime rattle.

Replacing your exhaust manifolds with headers still requires CATs.

QUOTE]

Pat is correct. Ford replaced the converters on my Vic at 75K... rattled like a can with stones in it. No charge.

Running without them is just not the thing to do. We don't need to be filthy Americans .....

I wonder what a complete set of low mileage MM converters is worth these days?

[Marauderjack]

QUOTE]Running without them is just not the thing to do!![/QUOTE]

And......removing the cats makes no more power.....only more noise and STENCH!!:mad2:

[Bad_S55]

I'll be the one to ask. Video?

[truegraw]

yea ill get you guys a video of it. it sounds kinda mean with a couple revs but under load/driving it sounds like strait pipes!! Like someone said i think the stock mufflers must be hollow! i wonder if i put some flowmasters on it if it would quiet it up very much?

[Bad_S55]

yea ill get you guys a video of it. it sounds kinda mean with a couple revs but under load/driving it sounds like strait pipes!! Like someone said i think the stock mufflers must be hollow! i wonder if i put some flowmasters on it if it would quiet it up very much?

Anything else would make it insanely loud. Might as well leave it with stock mufflers.

[truegraw]

so the flowmasters wouldnt quiet it any? any muflers, other than putting cats back on that will work?

[RubberCtyRauder]

Magnaflows better than flomaster. Flomaster tend to be raspy on these motors. Some people like it, I don't

[truegraw]

i was thinking of straight piping my turbo mustang and using the flowmasters off it but i dont want it to be loader than it is now. i have ran straight pipes on cars before and i swear it sounds the same as the stock mufflers on the marauder, surely the flowmasters will quiet it down some?

[O's Fan Rich]

Holy crap.....

[Finally]

yea ill get you guys a video of it. it sounds kinda mean with a couple revs but under load/driving it sounds like strait pipes!! Like someone said i think the stock mufflers must be hollow! i wonder if i put some flowmasters on it if it would quiet it up very much?

If you want flow masters I would run the 50 series. It will be quieter.

[Badass_forever]

I give up, proceed.

good, it will throw a cel, but it will not effect anything as far as performance.

[lifespeed]

cant get it done until Tuesday, if i get under there and beat the crap out of em will this help at all?

Maybe drive a couple nails through them and wrap them in bailing wire?

[justbob]

Now you need a head AND exhaust. Starting to wish you would've fixed the head and let the cat hopefully burn off once complete?

You have a dead cylinder, of course it's going to stink and be down on power.


Builder Of Badassery