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Can't Remove Stock Cats. Help!

Old 10-16-2008, 10:07 AM
  #61  
hellsoldiers08
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ya the place i took it to, had to use a blow torch and even that one didnt do it. So they went out of there way and bought a new torching system and sapposely they got it off with that. It just really pushes my buttons that nissan has to make that dam bolt so tight. Its not like it goign to really come loose and if it does i think the person would like the sound either way
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Old 10-16-2008, 01:06 PM
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I want to replace my exhaust myself. Cats and Exhaust. No headers. Am I going to be able to do this without a lift by myself?
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Old 10-16-2008, 02:41 PM
  #63  
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^^^ Yes, it can be done, as long as you have lots of patience, WD40 and jackstands... From what it sounds like, I would soad the **** out of every bolt that you're planning on removing...

I swapped out my exhaust on my 07 and I'v done cats on my 03, so its possible... some will be easier than others.
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Old 10-16-2008, 02:42 PM
  #64  
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Originally Posted by KS0385 View Post
I want to replace my exhaust myself. Cats and Exhaust. No headers. Am I going to be able to do this without a lift by myself?
I did.
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Old 10-16-2008, 05:21 PM
  #65  
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Okay, I talked to my buddy and he suggested a couple of things. Use ramps instead of jack stands. And use a Nut Splitter. Next question. Will the nut splitter fit?
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Old 01-18-2009, 10:27 AM
  #66  
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Just finished this on my '08 ZR. Here's what I encountered: 1)Scared of PB blaster (shows it eating a cup up on the can!) - this stuff can eat plastics. Used Liquid Wrench Penetrating Oil on nuts/bolts before using breaker bar (a must have). Yeah, it's about 2'. This method worked great 2) That stubborn top cat nut! Moved it w/the breaker bar "broke-it" then when using regular ratchet it laughed at me! Using many extensions from the front and regular ratchet, the bolt just broke off! Luckly, it doesn't thread in the header, just the cat and when it breaks, you're done. Both sides did the same. G/L on this. Now, I have the get that broken piece out in order to use the stock cats again.

H.
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Old 01-19-2009, 12:39 AM
  #67  
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AN IMPORTANT WARNING TO THOSE OF WHO WILL GET THESE INSTALLED.

BE WEARY OF USING IMPACT GUNS ON THAT TOP BOLT. The shock of the impact gun can break the primary O2 sensor. I prefer to use a breaker bar from the top. Remove the intakes and use a long extension and U-joint to get to the bolt.

I have never had to remove the header to get that bolt off. If you must break the head of the bolt off, remove the O2 sensor first before using your chisel.
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Old 01-20-2009, 03:21 PM
  #68  
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Originally Posted by Berk_Technology View Post
AN IMPORTANT WARNING TO THOSE OF WHO WILL GET THESE INSTALLED.

BE WEARY OF USING IMPACT GUNS ON THAT TOP BOLT. The shock of the impact gun can break the primary O2 sensor. I prefer to use a breaker bar from the top. Remove the intakes and use a long extension and U-joint to get to the bolt.

I have never had to remove the header to get that bolt off. If you must break the head of the bolt off, remove the O2 sensor first before using your chisel.


Just Disconnect them first and ur good.....
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Old 01-20-2009, 03:24 PM
  #69  
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Cut the bolt off and be done with it?
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Old 01-20-2009, 05:35 PM
  #70  
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I tried breaking the bolt off, and it broke 1 rachet, 2 extensions, and stripped a socket, before being stripped itself. Thats when I had to grind the bolt down with a die grinder. Took a good while, but it done the job. I had to squeeze my hand behind the intake manifold.
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Old 01-20-2009, 06:50 PM
  #71  
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Jesus, this sounds like a lot of effort that I wouldn't expect
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Old 01-20-2009, 07:40 PM
  #72  
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I took my car to a shop full of asians and they got the bolts off in minutes.

..through the engine bay, they used a long extension with a breaker bar..
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Old 01-21-2009, 01:03 PM
  #73  
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^^^How Many Asians does it take to unscrew a bolt?? lol
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Old 01-21-2009, 05:54 PM
  #74  
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there seems to be an occasional issue w/ these .... some come right out w/ out much effort, and well others will make you get a bit creative w/ them! Same w/ the o2 sensors .... i've had one stick in a cat and not want to move, every other one has come right out for me, but i've seen a few posts about this on this board as well.
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Old 01-22-2009, 09:58 AM
  #75  
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I've heard from a lot of people locally now since asking that they just shear the head off the top bolt and replace it.
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Old 10-20-2015, 08:15 PM
  #76  
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In the same boat as the OP, how do you fit a grinder down there on that last bolt to grind it off? I have one bolt left on the driver side, the top one. I've cut the cat off from the cat flange and headers. I'd like to grind the head but not sure how to go about doing so

Last edited by pwice; 10-20-2015 at 08:21 PM.
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