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Old 01-22-2003, 02:36 PM   #1
Eaglesfan2422
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Default easier way to break up cat material in uppipe

i'm in the middle of gutting my uppipe, my darn drill bit keeps sliding around but i was able to get 3 holes all the way through the cat. i started chipping away along the sides with a flat-head and a rubber mallet, but it's taking forever and it feels like it doesn't want to go down any further. can't fit my pliers in there, and i can't find my needle nose ones but i think they would be too flimsy anyways. how are you guys that have done this breaking up the material inside?
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Old 02-10-2003, 04:42 PM   #2
thrdeye
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Sorry I didn't see your thread earlier, you've probably already got it gutted by now but.....I took a big flat head screwdriverand knocked it as far into the cat as I could, to the point wher I could not turn the screwdriver. I then took a pipewrench and turned the screwdriver with that. it breaks up large pieces of the cat. Now, anyone know how to get to the area below the EGT bung?
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Old 02-10-2003, 05:54 PM   #3
Chuck H
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From the pics I've seen of the cat material in the uppipe, it's a metallic substrate cat rather than your typical cheaper ceramic cat. It's going to be MUCH harder to get everything out of there because it's not brittle like the ceramic substrates.

I know this is becoming a very popular "mod", but I'd be really worried about leaving a scrap of the substrate behind that's going to come loose and grenade the turbo. Personally, I think it's worth the peace of mind to pay the money for an up-pipe instead.
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Old 02-10-2003, 06:05 PM   #4
vile
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ur probably done by now....don't stress it...it took me a good 1:15 w/another set of hands....the key is to just keep at it, a little at a time......afterward, i used a wire wheel brush and really got the inside of it clean.....

patient little grasshopper
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Old 02-10-2003, 08:17 PM   #5
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just keep at it...It took me 5 hours to do it. I felt like I needed a break so i soaked the cat with some lighter fluid and set it on fire. I doubt it helped, but it sure made me feel better

-Jack
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Old 02-10-2003, 09:09 PM   #6
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I put it in the oven for 5 minutes at 350F. Or was that the headlight mod?

Removing all the cat took me about 2 hours, including a few breaks. The first 90 minutes was painstaking, but the last 30 minutes the cat broke apart and started falling out.
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Old 02-10-2003, 10:27 PM   #7
sil0nt
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ok, i have a question...

i've seen pics and read howto's on gutting your own uppipe.. so i am fairly confident i understand the whole process... but.. does the cat stick to the sides? for example, lets say i am 95% done.. will that mean i have a bunch of material stuck on the inside wall of the uppipe that i have to scrape out? this is the only scenario i could imagine causing any doubt as to whether or not the uppipe is free of turbo-fatal fragments. and, if this is indeed the case, then how do people clear this part off? a large metal brush (think oversized pipe cleaner) or dremel w/ metal brush attachment?
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Old 02-11-2003, 08:37 AM   #8
thrdeye
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Aside from the area under the egt bung you can place a screwdriver at the top of the pipe where the cat starts and kind of "chisel" it away. You should get medium sized chunks falling off the sides. As for the area under teh egt bung...try to find a bent screwdriver (and curse a lot...this seems to help).

Question. I believe I may have drilled into the wall of my pipe a bit. It didn't go through, maybe just a centimeter-deep little crater in the side. Will this hurt anything? It doesn't look bad. I'm not stuck, because it is a stocker that I bought. My original pipe is still on the car.
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Old 02-12-2003, 09:44 AM   #9
T-WRX
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I used a screwdriver to remove all the cat material. It is bonded, not welded to the wall of the uppipe.

thrdeye - if it doesn't look bad, go ahead and install it.

The worst I can think of is that it fails (cracks) in time at the point you damaged. Then you would have a leak, which is detectable by sound and loss of power. You would be forced to perform an emergency uppipendectomy, but should have a full recovery.
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Old 02-12-2003, 12:00 PM   #10
instant
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LOL,
I can't quite poinpoint why, but this thread has me in stitches.

I have done 2 of these and am lucky to have a machine shop close at hand. - Once you pull that thing off your car and whack at it for the first time - You're commited! There is NO worries about leaving any material behind It will be blindingly obvious!

Besides, if you wreck your turbo, I know where you can get shiny new upgrade
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Old 02-12-2003, 11:06 PM   #11
thrdeye
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luckily the pipe I'm using is a stocker that I bought. MY PIPE is still in the car and 100% catified
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Old 02-13-2003, 10:12 AM   #12
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easiest way..throw it in the trash and get a proper decatted up-pipe..it is not worth the effort to decat it yourself (trust me, I did it once...once)

Adam
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