kompressor85

my deal is i have a 02 sport coupe, and i looked at the underchassis very wel today when i had it up on the lift and something isnt making sense.

as it was explained to me: there were two catalytic converters. one right off the header, one midway down, then a resonator, muffler and tip.

from what i saw, there is only one catalytic converter, none right off the header, just midway down the exhaust, then the resonator, muffler, and tip.

so either i'm calling a cat a resonator or missing something completely, anybody got any ideas why i'm only seeing one cat?

chixdiggit

Were you looking at the bottom by lying down or was your car on the lift?

The one off the header is tucked underneath and would be difficult to see without getting right underneath the car. It should be on a steep angle like a part of the down pipe. The secondary should be right underneath the car in plain view.

advans

you are right, there are 2 sets of cats, a resonator and then a rear silencer.

it goes. ENGINE--->headers--->CAT 1 (should be just one)--->CAT 2 (for my 3.2 there is 2 cats here)--->RESONATOR---->REAR SILENCER

kompressor85

well, i had it up on a lift, and had a clear view. i could see the block, head, headers, mid pipe, cat, resonator, and muffler. there simply was not a catalytic converter anywhere near the head.

are ya'll sure theres a secondary cat on the 02 sport coupe? maybe you're thinking of the M271 or another year? i wonder what a MB parts site has to offer....

advans

yes. I am sure. the exhaust system on all non-amg coupes are the same. for M111, M112, M271, M113

kompressor85

well, i appreciate the input, and i can tell all my stuff is factory, and there simply is not a catalytic converter on or near the head. the only cat is midway down the car, about 18" before the resonator.

KIRA

wtf... u stole my coupe color...

Saprissa

just take a picture of the whole set up when your car is up on the lift,
and someone will be more than happy to photoshop arrows in the pic and show you all the parts. (or missing parts ).

Carlos

Saprissa@aol.com

kompressor85

i dont need photoshopped arrows, i'm known to be rather oblivious at times but one cannot miss a damn catalytic converter near the header. i traced the entire system visually..... and i probably know more about cars than 90% of the users on here. i'm just plain stumped, the analysis doesnt match the standards!


EDIT: re-read my post and it comes off like i'm being a serious jerk, please dont take it that way!

advans

woah buddy. 90% of the users here probably know more about cars than you do. alot of our members are in the automotive business.

since your the expert, you can probably answer your own question.

1. either you have had a cat delete (assuming ur car is used). then you can see if there is any cut marks.

2. your counting wrong. the entire after header exhaust system on the coupe is the same from C180-C350

*EDIT* that is excluding the CDI models.

kompressor85

hey yeah, i tried to edit my post saying that i sounded like i was being a comlpete jerk and hothead and didnt wanna come off that way, but either my connection of mbworld.org wasnt responding, and i had to study.

oh and i already worded my previous post as to say that there were no aftermarket cuts or welding done. so yeah. i'm stumped. unfortunately i'm leaving the base by wednesday hopefully so i wont be able to get under it for a while. i wish i had taken photos! grrr

Saprissa

Now, I'm hella curious as to what your undercarriage exhaust set up looks like, if it wasn't cut or welded or anything.

I don't subscribe entirely to Advan's statement that all Coupé exhausts are equal. 1.8L / 2.3L / 3.2L tubing diameter is different; some have resonators, some dont; muffler sizes are different too.

Anyway, next time each of you are under the car (myself included), snap some shots of the entire exhaust set up, and let's compare. Post pics here, so that this thread becomes a helpful tool !

Carlos

Saprissa@aol.com

advans

well carlos, Im sure the sizes of 1.8 to 3.2 is the same. thats what MB had told me, eisenhaus, and comparing c230o5's undercarriage as to mine.

Im sure his car has to have atleast 2 sets of cats. the first set of cats are quite hidden.

if his car was without cats, then that would be quite interesting. maybe M111s dont have first cats.

but again, question is. does his existing cat have the sensors located there?

oel

offtopic,
How do you remove intake resonator?

kompressor85

yes there is two 02 sensors that i took note of..... one where the pipe makes a turn and becomes parallel with the ground, and a second just past the cat converter.

also: to remove the intake resonator on M111 engine, remove stock airbox. the bolt on the right and hoseclamp on the left. remove the intake assy on the passengers side of the car (left hand drive car that is), which is a torx bolt or two. then disconnect the six bolts holding the bottom peice (big peice of aluminum) in place. now take that off of the car and remove the plastic peice. find an aircraft locknut to seal the hole that would be left. tighten. re assemble. its really rather easy, but requires a toolbox that has both internal and external torx.

well, i'm off to go fly a mission. ciao!

advans

It should be something liek this...

oel

I don't quite understand
Do you have a picture of it?
Thanks

kompressor85

well, you remove the air filter. simple enough. one bolt and one hose clamp.

then there is the upper manifold peice (big blocky thing on the right hand side of the engine.) that will require you to remove the electrical connector, a few vacumm hoses, and a hose clamp. that slides off rather easily too.

under neath of that, is a large peice of piping. its all aluminum and shaped rather funny. there are six torx bolts holding it in place. unbolt that peice, remove from car. flip it over and you'll see the resonator bolted to the bottom of it. undo the three bolts that hold it in place. one of the bolts goes through the housing, and you'll need to have a metric aircraft quality locknut to hold the bolt in place, otherwise you'll leak air. tighten bolt.

reinstall. the reason you dont understand what i'm talking about is because you arent doing it while following the directions....trust me, as long as you have some torx sockets (female sockets) and a hex key set, you'll be golden. it literally takes like less than five tools to do it. sounds great too. good luck!



this is exactly how my exhaust is constructed under the car. it certainly doesnt split off into two secondary cats either.

drexappeal

Advans, you have to remember, the v6 block is going to have a different setup than the supercharged i4's. Your pictorial is correct only for the v6's.

drexappeal

You are correct. The supercharged i4's (m111 and m271) have this setup. Only 1 cat, 1 resonator, 1 muffler. The supercharged i4's design does not need 2 cat's because the headers come to a single collector before the cat and connecting pipe to the resonator, then on to the muffler.

The v6 models have a different setup from the headers to the secondary cats.

Only thing that is consistant for all the models is the size of the piping (estimated 2.5-2.75) - My guess would be 2.5, cuz it doesn't look close to 3 inches.

kompressor85

ah, i see. thanks for the clarification, i was quite stumped when i found out that i only had one cat!

EDIT: do i have any other options besides spending a small fortune of headers? it seems i missed those $500 headers made by a guy on this board by about a month. i so would have picked up a set. $2000 for kleeman headers? i could probably get a set of headers custom bent and tig'd for that price! sheesh.

C230 Sport Coup

It took 20 posts to get the correct answer? And I was forced to read to the end so I wouldn't double post? All you 111 experts eh?
The C320 has 2 cats?
Thats good to know.

No one had headers for this car for 500. That was that douchbag on some W202 forum who claimed he designed them hisself in Texass.
Turned out they were from Deutchland.
You can still buy them from that company, the link is posted around here somewhere when I pwned him. Less than 500, if you want to try and work with them.
They had short pipes. The Supersprint is the sheeite.
Long pipes, excellent power across the range.
If you can find one it's well worth it.
That, muffler and ASP make an excellent combo I can tell you from experience.

Pul-lease...
windshield wiper fluid, and whistle tip in the sig, gotta go!
Resonator delete too, since a lot of cars came without them...
not really a mod, removing something.

C230 Sport Coup

Here's the link to the SS's.

Call 'em and see if they'll cut a deal?

http://www.supersprintna.com/product...arch_model/202

advans

well, the 320 has 2 sets of cats. right after the header, then right before the resonator again. first set is 1 cat, second set is 2 cats.

anyways, kompressor85, I rememebr someone on "the other forum" was giving away a track pipe for the M111.

C230 Sport Coup

That was me...it was a custom pipe, supposedly a cat delete pipe, that I bought from another member that turned out to be useless. 30 bucks down the drain, oh well.
It went into the recycle bin, it's gone.