Menu

1A Auto Video Library
Our how-to videos have helped repair over 100 million vehicles

How to Remove Cat-Back Exhaust 03-07 Cadillac CTS

Share on:
  1. step : Removing the Exhaust (0:48)
    • Raise and support the vehicle
    • Disconnect the O2 sensor wiring harnesses
    • Remove the O2 sensors from the exhaust with a 22mm wrench
    • Remove the four 14mm bolts from the exhaust
    • Allow the exhaust to hang
    • Loosen the two 13mm bolts from the exhaust cross brace
    • Remove one 13mm bolt from the exhaust cross brace
    • Pull the cross brace aside
    • Apply rust penetrant to the exhaust hangers
    • Pull off the exhaust hangers
    • Pull down the exhaust
  2. step : Installing the Exhaust (3:11)
    • Hook the muffler onto the rear two exhaust hangers
    • Lift the exhaust into place
    • Put the exhaust cross brace into place
    • Start the exhaust cross brace bolt by hand
    • Attach the remaining exhaust hanger
    • Tighten the two 13mm bolts into the exhaust cross brace
    • Replace the exhaust gaskets if necessary
    • Line up the exhaust bolt holes
    • Start the four 14mm bolts into the exhaust flanges
    • Tighten the 14mm bolts to 16 foot-pounds
    • Put the O2 sensors into place
    • Use an O2 sensor socket to tighten the O2 sensors to 40 foot-pounds
    • Connect the O2 sensor wiring harnesses

Brought to you by 1AAuto.com, your source for quality replacement parts and the best service on the Internet.

Hi, I'm Mike from 1A Auto. I hope this how-to video helps you out, and next time you need parts for your vehicle, think of 1AAuto.com. Thanks.

In this video, we're going to be working on our 2006 Cadillac CTS, 2.8-liter V6. We're going to be showing you how to remove the cat back exhaust or the mid-pipe and muffler. In this case, it goes from this flange over here all the way out the back of the car. If you like this video, please click subscribe. We have a ton more information on this car as well as many other makes and models. If you want to put these parts on your car, check out the link in our description. Here are the items you'll need for this repair.

We're going to use a lift to make this easier to show you guys at home, but you should be able to do this in the driveway with a jack and jack stands. Locate the O2 sensor connector on the transmission. This is going to be on the left side of the tranny for the driver side O2 sensor and the right side for the passenger. This process is the same for either. Remove the safety on the connector, lift up, and release the electrical connector for the O2 sensor. Using a 22mm wrench, remove the O2 sensor from the exhaust. Disconnect the O2 sensor on the passenger side and remove it the same way as the other.

Remove these four 14mm bolts from the exhaust with a 14mm socket and ratchet. Separate the exhaust and allow it to hang. Remove these two 13mm bolts securing this cross brace under the exhaust. As you remove the last bolt, be sure to support the exhaust so it doesn't just fall. Push this down. Now that we've got it loosened up we can just move it out of the way, allow our exhaust to hang down a litter farther.

We have three rubber exhaust hangers here, got the muffler, we're going to spray some penetrating oil around of them to make them slide out of the rubber easier and then simply pull them over the ends and bring the exhaust down. Support the exhaust as you drop it out of the last hanger. Remove it from the vehicle.

We'll hook these three points into the rubber mounts, up here under the car. Lift on the exhaust once the rear two hangers are in place. Slide the center bracket in and hook it in. Start the bolt by hand. Now it's supported and easier to install our last exhaust hanger.

Tighten up your two 13mm bolts on the center support. This is not a machine surface or a seal of any type, so you just have to get them tight. We just recently replaced our catalytic converters, so there's no need for us to replace our exhaust gaskets. If yours need to be changed, you can pry them off with a flat blade screwdriver or you may have to break them off with a chisel. Install the new one, then we'll line up our pipes, and reinstall our four 14mm bolts. Tighten up all your bolts, and make sure that they seat onto the exhaust gaskets evenly.

Torque these bolts to 16 foot-pounds. Reinstall the O2 sensors into the bungs. Use an oxygen sensor socket, torque the O2 sensors to 40 foot-pounds.

Thanks for tuning in. We hope this video helps you out. Brought to you by www.1AAuto.com, your source for quality replacement parts and the best service on the Internet. Please feel free to call us toll-free, 888-844-3393. We're the company that's here for you on the Internet and in person.

Thanks for tuning in. We hope this video helps you out. Brought to you by www.1AAuto.com, your source for quality replacement parts and the best service on the Internet. Please feel free to call us toll-free, 888-844-3393. We're the company that's here for you on the Internet and in person.

Tools needed for replacement:

    General Tools

  • Jack Stands
  • Floor Jack

  • Materials, Fluids, and Supplies

  • Rust Penetrant

  • Ratchets & Related

  • Ratchet
  • Torque Wrench
  • Socket Extensions

  • Sockets - Metric

  • 14mm Socket
  • 13mm Socket

  • Wrenches - Metric

  • 22mm Wrench


Search Videos
Go To Top


Same Day Shipping

Orders ship same day when ordered by 2pm ET. Need your part faster? Choose expedited shipping at checkout.


Guaranteed To Fit

Providing you the highest quality, direct fit replacement auto parts enforced to the strictest product standards.


USA Customer Support

Exceeding customers' expectations every day, our team of passionate auto enthusiasts are here to help.


Instructional Video Library

Thousands of how-to auto repair videos specific to year, make and model guide you step-by-step through your repair.

Loading...