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2004-2007 Cadillac CTS-V General Discussion Discussion, For Those of You Who Have Replaced/Removed Your Full Exhaust... in Cadillac CTS-V Series Forum - 2004 - 2007; Happy New Year everybody. So as soon as the weather breaks here in MI I will be replacing all of ...
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    jeph054 is offline Cadillac Owners Fanatic
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    For Those of You Who Have Replaced/Removed Your Full Exhaust...

    Happy New Year everybody. So as soon as the weather breaks here in MI I will be replacing all of bushings in the rear end. I need to remove the exhaust to do this. My question is this, I just know (cuz they are rusted as @#$%) that the studs on the header downtube will snap off. Has anyone run into this problem and what was the fix? Drill out the hole and just put a bolt through? Everything is Stock on my 07 (I have about 60K miles on it )so the exhaust has never been touched before. My goal is to have all the extra parts I may need (due to breakage etc) before hand so when it comes time to do the repair, my downtime is minimized as this is my daily driver. Suggestions? Comments?

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    kyle242gt's Avatar
    kyle242gt is offline Cadillac Owners Member
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    Re: For Those of You Who Have Replaced/Removed Your Full Exhaust...

    Mine came apart pretty easily, but that's CA for you.

    I'd attempt to soak with penetrating oil for a few days, smack with a hammer, crack loose, soak again, etc to see if they'll loosen up.

    If they break off, you'll have to center punch and drill them out. Then just use SS through bolts instead of studs.
    Faber likes this.

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    fweasel's Avatar
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    Re: For Those of You Who Have Replaced/Removed Your Full Exhaust...

    I was worried about the same situation. I soaked them with PB a day before I dropped the car off at the shop for trans and rear bushing work. They had no problems, even though everything had a good 50K of patina on them. I put some anti-seize on the stud threads afterwards to help with the next time.

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    jeph054 is offline Cadillac Owners Fanatic
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    Re: For Those of You Who Have Replaced/Removed Your Full Exhaust...

    Yeah i was going to soak the crap out of them for at least 24hrs with multiple soakings and cross my fingers. There doesn't look like much room to get a wrench on the bolt if i have to drill it out. I was also thinking of throwing some heat on the nut as well...

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    fweasel's Avatar
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    Re: For Those of You Who Have Replaced/Removed Your Full Exhaust...

    I asked my mechanic if they gave him any trouble. He said He used deep well impact sockets and his cordless impact gun. Spun right off.

  7. #6
    jeph054 is offline Cadillac Owners Fanatic
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    Re: For Those of You Who Have Replaced/Removed Your Full Exhaust...

    Quote Originally Posted by fweasel View Post
    I asked my mechanic if they gave him any trouble. He said He used deep well impact sockets and his cordless impact gun. Spun right off.
    I have both so maybe the same will happen for me. I am hoping it looks worse then it is. Thanks for checking.

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    wmouser22 is offline Cadillac Owners Member
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    Yes, soak with PB for a couple days, reapplying daily. A little heat won't hurt either. YOU DO NOT WANT TO SNAP IT OFF AND DRILL IT OUT. Ask me how I know,,,,,, twice. And that was even after soaking them for 24 hours. I'm pretty sure Superman is made of exhaust flanges

    image-2104854952.jpg
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    ctsv247 is offline Cadillac Owners Enthusiast
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    Re: For Those of You Who Have Replaced/Removed Your Full Exhaust...

    Soaking with PB is great here but you may ultimately revert to the red wrench. Nothing like a little heat to get the party started just make sure you wipe off all the excess PB before firing up the torch.

  10. #9
    jeph054 is offline Cadillac Owners Fanatic
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    Re: For Those of You Who Have Replaced/Removed Your Full Exhaust...

    Quote Originally Posted by wmouser22 View Post
    Yes, soak with PB for a couple days, reapplying daily. A little heat won't hurt either. YOU DO NOT WANT TO SNAP IT OFF AND DRILL IT OUT. Ask me how I know,,,,,, twice. And that was even after soaking them for 24 hours. I'm pretty sure Superman is made of exhaust flanges

    Attachment 175490
    Wmouser22 - This is EXACTLY what I am worried about! I have worked on flange bolts before where I soaked the crap out of them with PB for like a week and they still broke. To be on the safe side I think I will do what Ctsv247 suggests by doing both PB and the Red wrench. I REEEAAALY dont want to drill them out. After all this will be the beginning of the project and that is not how I want to start it...

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    Re: For Those of You Who Have Replaced/Removed Your Full Exhaust...

    If this was my daily driver and I needed to avoid downtime I would take it to a muffler shop before starting the project and have them remove and replace the exhaust fasteners in question. This advice, however, is based on the fact that muffler shops in my area are notoriously cheap as compared with other types of repair shops.

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    Re: For Those of You Who Have Replaced/Removed Your Full Exhaust...

    I personally had trouble with them snapping. I got the stud removed with heat and vice grips the I tapped and cleaned the threads and used bolts. I wish I would've drilled the holes and gone with a bolt and locking nut. For the one piece stock exhaust the studs are kind of nice. But for my new setup where I have flanges before the rear diff I don't like the studs. It's easier to drop the front end of the exhaust and x pipe by removing front bolts and the rear bolt and nuts. I am afraid though that I will need to drop the exhaust and the bolts will seize or break in the threads on the cats. Debating just drilling out the holes

  13. #12
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    Re: For Those of You Who Have Replaced/Removed Your Full Exhaust...

    The Red Wrench

  14. #13
    farsighted770 is offline Cadillac Owners Member
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    Re: For Those of You Who Have Replaced/Removed Your Full Exhaust...

    Quote Originally Posted by fweasel View Post
    The Red Wrench
    I've called ex girlfriends that before...

    original EDIT: oh... WRENCH... well... ummm nevermind then.

    EDIT again... oh boo... the board doesnt show "reason for editing"... it would have been funnier if it worked.

    OP just take your time and soak em, if they fight add heat. worst case scenario it snaps just weld a length of metal to the broken bold for leverage, i've had to do that before... it sucks.

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    ctsv247 is offline Cadillac Owners Enthusiast
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    Re: For Those of You Who Have Replaced/Removed Your Full Exhaust...

    Quote Originally Posted by darkman View Post
    If this was my daily driver and I needed to avoid downtime I would take it to a muffler shop before starting the project and have them remove and replace the exhaust fasteners in question. This advice, however, is based on the fact that muffler shops in my area are notoriously cheap as compared with other types of repair shops.
    This theory has a lot of merit. A good muffler shop deals with this kind of stuff everyday and will have the right $100 snap-on stud extractor to do something like this quickly and affordably.

    I'll go see my muffler budy to discuss this further because I DD mine as well and don't have the time to run into these issues!

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    thebigjimsho is offline Cadillac Owners 10000+ Posts
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    After I snapped mine, I drove a mile down the road and had the shop install.

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