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Old 07-08-2002, 02:47 PM   #1
m750
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Default MRT exhaust owners, any cat problems?

I"ve had the exhaust on the car for less than a year, and I've found my cat is breaking up (or so the dealer says). Anyone else having the problem? I recall frogger (I think) mentioning the problem. What have you done? I wrote MRT an email, but I don't have any clues what they are going to say about it. I'm most likely going to have to purchase a new replacement cat, but maybe I'll get a replacement as this has only been on the car less than a year. It might be time to call lou, and have one made up.
AO
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Old 07-08-2002, 08:23 PM   #2
obyone
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Dude your scaring me. I want to buy an MRT header back system. Brett from MRT assured me that their stuff isn't crap. He said everything (exhaust) has a 2 year warranty and that the system won't throw a CEL. (Given that the rest of the car is running correctly)

I've heard elsewhere that the MRT cats have been shot after only a few months of use. Brett said this was untrue. Please tell me that you bad cat was the fault of you car and not the exhaust, because I'll have to start from square one again if it's not.

(No bad kharma intended)
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Old 07-08-2002, 11:05 PM   #3
m750
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Talking don't fret...

The Cel is semi selective, and currently my car isn't running it's best, due in at least part to my own doings. Though the exhaust is (at least in the past) the cause of _my_ cel. If I had an early 00, I wouldn't have to worry about it (they don't throw the code). And to be honest, I didn't worry about it, it's only an emmisions related code. Maybe there was a bad batch of cats, maybe it was due to the rich running nature of the 01's. What you should base your decision on is whether or not he stands by his product. I haven't had a complaint otherwise. The performance, and sound are exactly what I expected. And if he stands by his product, I'll be even more happy.
AO
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Old 07-09-2002, 08:42 AM   #4
froggert
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Unhappy

finally got around to pulling the headers off my car last night. the cat is shot - shook a couple of chunks out of the exhaust piping and the rest is floating around in the cat housing.

system's been on the car 10-11 months and has less than 10k miles. there aren't any dents or marks on the outside of the cat, either, so it's probably not from hitting anything.
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Old 07-09-2002, 08:48 AM   #5
MY99 2.5GT
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Ive only had my MRT system on for about 3 weeks so I can't really speak for the longevity of these cats.

Let me know how the warranty claims turn out.

Keep us updated.

Brad
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Old 07-09-2002, 08:57 AM   #6
m750
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Talking so far so good.

So far so good. I've already recieved a responce from Marcus. At this stage in the game, the plan is to get some photographs of the damaged cat, so they can verify the damadge, and that it wasn't caused by impact, or race fuels. I've only competed in a few rally crosses, and never used any race fuels used in the car, so it should be fairly straight forward. It's extremely possible that the cats were damaged in shipping, and Marcus agreed that it's rare for a cat to fail in such a short period of time.
So... time to take off my cat, I guess it's a good thing I got it flanged from the headers before coating. Froggert, I'd recomend contacting MRT, they are a stand up company, and will stick behind thier products.

AO
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Old 07-09-2002, 09:41 AM   #7
kickin_81
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So from what I'm reading, the only way to find out if your MRT cat being shot is from taking the system off the car and apart? I'm also in the MRT boat, and had bad scuff marks and dents on my system from the carrier. I could be another victim.
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Old 07-09-2002, 05:27 PM   #8
froggert
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m750, do you happen to have an email addy for marcus?

this is the biggest chunk of cat stuff that got through to the muffler section:
Attached Images
File Type: jpg cat.jpg (15.8 KB, 142 views)
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Old 07-09-2002, 07:11 PM   #9
NDconKG24
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Default MRT movement

I have an MRT exhaust system on my 2000. After driving around for a little, I noticed that something was squeking underneath the car. I put the car on a rack and noticed that it would move around a ton. This movement was also making my transmission dance around a little bit as well I guess this might be due to a lack of support provided by the single exhaust bolt mount thingy before the cat. All this movement might explain why the cat's have been going out. I dont know.

On a side note, I do have a 2000 and have yet to see a CEL. I'm hypothesizing that this could be due to the fact that I didn't cut any wires when connecting my rear O2 sensor. If I'm not mistaken, that is the one that typically fails. I had to cut a few ties to get it to fit, but so far no CEL.

NDconKG24
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Old 07-09-2002, 08:45 PM   #10
skid00skid00
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Default Splice w/o CEL

I DID splice my O2, no CEL after a couple k miles...
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Old 07-09-2002, 09:04 PM   #11
Reciprocity
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I spliced my O2 sensor line as well...and threw many many CE lights (cat effic) for a while....but it only happened under the following conditions...

Cool weather (50's)
Steady cruising around 47-49 MPH (90% of the time it was at 47)
4th gear, low revs...around...I want to say 2900 RPM

And 80% of the time it was the same stretch of road...very slight downhill in the evening, 45 MPH speed limit. There is a cop that hangs out on this road all the time so I'm always cruising the speed limit in "quiet mode" (AKA 4th gear) and it nearly never fails. I can almost make the CE light come on that way.

But since it's warmed up, I haven't gotten one in a while.

Nc
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Old 07-09-2002, 09:15 PM   #12
Patrick Olsen
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Default Re: MRT movement

Quote:
Originally posted by NDconKG24
I have an MRT exhaust system on my 2000. After driving around for a little, I noticed that something was squeking underneath the car. I put the car on a rack and noticed that it would move around a ton. This movement was also making my transmission dance around a little bit as well I guess this might be due to a lack of support provided by the single exhaust bolt mount thingy before the cat. All this movement might explain why the cat's have been going out. I dont know
That little bracket actually broke on my car. I have since installed just a regular exhaust hanger a bit forward of where the mount extends from the header pipe. Things are quite a bit tighter now. However, I need to order some poly exhaust hangers, as I get some clunking in the rear (which I'm pretty sure is the muffler section) during track events during hard right turns. That's not the MRT system's fault - the stock system used to do it too.

As for the cats, mine seems to be fine. I just had it off a couple weeks ago to replace the gasket between the header and cat (m750 and I both had our cats cut off the header so we could get the header ceramic coated). It's been on the car as long as m750s, and I have significantly more mileage - without walking outside to look at my maintenance log I would guess 35,000 - 40,000 miles. Nonetheless, I've been debating getting a "better" cat to put in it's place. Brullen makes some pretty high-quality, compact cats that I think would fit nicely. That's on the list of things to do...

Pat Olsen
'97 Legacy 2.5GT sedan

Last edited by Patrick Olsen; 07-11-2002 at 10:23 AM.
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Old 07-10-2002, 10:40 AM   #13
MY99 2.5GT
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The exhaust tech that made my Mid-Pipe and Muffler piping told me that a 2 to 1 hi flow cat would work a lot better then the way the MRT Cat is set up. If you look at the MRT you will see the secondary piping from each cylinder bank collects into one main pipe. He was saying just run the two secondary pipes straight into a 2 input 1 exit cat. Who knows.

Brad
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Old 07-10-2002, 11:15 AM   #14
kickin_81
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Since we're on the subject... Brullen's (or any universal hi-flow) cat comes in a certain length. How would you know what length will keep the MRT from sticking out too far or too deep? I was considering (not yet researched) a cat replacement once the MRT's cat dies with a common brand cat, but thinking if it will bolt to a two bolt flange or have proper size/length. I'm a newbie when it comes to performance.
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Old 07-11-2002, 10:25 AM   #15
Patrick Olsen
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Quote:
Originally posted by kickin_81
Since we're on the subject... Brullen's (or any universal hi-flow) cat comes in a certain length. How would you know what length will keep the MRT from sticking out too far or too deep?
I wouldn't worry about it too much. If the Brullen (or whatever brand you go with) cat is too long, just have the muffler shop take it out of the mid-pipe. It would cost you a bit more, since they'd have to do a bit more welding, but it should be a pretty simple fix.

Pat
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