GMT 800 & Older GM General Discussion 2006 & Older Trucks | General Discussion

How difficult to remove the cats?

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Old Apr 13, 2005 | 05:16 PM
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Default How difficult to remove the cats?

I dont have access to a lift so this would be a driveway job. I can weld at the table, but havent tried doing it on my back. How difficult is the job? Im assuming all that is involved is taking a sawzall to the pipes to cut out the cats and then welding some 2.5 pipe (since its before the Y) in its place and bolting them back up to the headers?? Are you guys taking off the whole catback and then welding on the table and then trying to get everything back up? Anyone have any pics?
Thanks
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Old Apr 13, 2005 | 07:14 PM
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I had mine done at a shop it took him about 30minutes..... He used a plasma cutter though instead of the saw... he tried the saw ans he went through 3 blades before switching to the cutter...... Then welded about a 1ft peice into the places.... Didnt look to be too hard...
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Old Apr 13, 2005 | 07:17 PM
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Originally Posted by CAMMIN03'
I had mine done at a shop it took him about 30minutes..... He used a plasma cutter though instead of the saw... he tried the saw ans he went through 3 blades before switching to the cutter...... Then welded about a 1ft peice into the places.... Didnt look to be too hard...

Same thing with my truck.
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Old Apr 13, 2005 | 10:50 PM
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If you want to do it yourself you could unbolt the y-pipe and then punch out the cats and then bolt the y-pipe back into place. Thats what I did. It took about 3 hours.
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Old Apr 14, 2005 | 03:33 AM
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Yeah it depends if you want to gut them or take them off..... I have heard, and dont quote me on this... that it will create turbulance if you leave them on, and empty... I really dont know about this very much... but i do know that I have mine completly gone and I gained (these gains are not common) 22rwhp and 27rwtq
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Old Apr 14, 2005 | 02:24 PM
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Originally Posted by quicksilverado
If you want to do it yourself you could unbolt the y-pipe and then punch out the cats and then bolt the y-pipe back into place. Thats what I did. It took about 3 hours.
I guess I'll have to get under there and see what I can do. If I can just unbolt the Y pipe and stick something in there to gut them and bolt it back up than I will do that. Will that cause problems with all that crap blowing through the muffler?
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Old Apr 14, 2005 | 02:35 PM
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I gutted mine after the header install. Had them cleaned and put back up in about a hour.
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Old Apr 14, 2005 | 05:02 PM
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Originally Posted by SportSide 5.3
I gutted mine after the header install. Had them cleaned and put back up in about a hour.
Did you do this in your driveway? Did you leave your cat back on and just let the Y pipe hang while you went after the cats?
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Old Apr 14, 2005 | 05:21 PM
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Took the whole y pipe off in the driveway without lifting it.

My neck was hurtin' though.
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Old Apr 14, 2005 | 07:17 PM
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would removing them cause any tuning / computer code problems?
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