Cat back Exhaust for Jeep Cherokee XJ

Cat Back Exhaust for Jeep Cherokee XJ

My old exhaust was crumbling apart. The tip had fallen off behind the holder and the muffler had a huge crack in the bottom. It rattled and rumbled.

Old Rusty exhaust
Old Rusty exhaust

I ordered the Dynomax system from Summit Racing through their Ebay store. It arrived in just a couple of days after I ordered. I had to laugh at the UPS man struggling with the huge box coming in my office door.

Smash checking out the package
Smash checking out the package

I began by lifting my Jeep and using a reciprocating saw to cut the muffler loose from the catalytic converter. There were a lot of old welds here so it was pretty messy. I cut the muffler to get room to work to clean it up.

Cutting off the old
Cutting off the old

The clamp at the rear hanger broke when I tried to unbolt it. I just twisted it out of the way. With both ends loose I was able to remove the muffler and tail pie as a unit from over the axle.

Old Exhaust out of the way
Old Exhaust out of the way

I used a variety of metal working tools to clean up the end of the cat. I cut off the bulk of the old pipes and weld beads with a torch. Then I used a 7 inch grinder to clean up the slag. I finished with my 4 ½ inch grinder fitted with a flap disk.

Old welds gone
Old welds gone

When I finished the reducer include in the kit slipped smoothly and snugly into place on the cat. There was a small hole in the pipe coming out of the cat so I elected to weld this joint closed rather than use the included clamp.

Reducer in place
Reducer in place

Next I slipped the muffler into place. I supported it on a stand while I fit up the tail pipe. It took some wiggling to get the tip to line up where I wanted it between the spring and the trailer hitch. When I finally got it in place I used a ratchet strap to hold it in position while I put a tack weld between the muffler and the tail pipe.

Muffler in place - Jeep Cherokee
Muffler in place - Jeep Cherokee
Tail pipe in position
Tail pipe in position

To get the rubber donut to connect properly with the hanger welded to the tail pipe, I removed the two bots that hold the hanger to the body. Then I slipped the donut over the hanger on the pipe and then I reattached the hanger using the bolts. This seemed easier than wrestling with the heavy rubber, which was cold and inflexible.

Rubber doughnut hanger
Rubber doughnut hanger

I then tightened the clamp on the rear hanger making sure the pipe was still positioned where I wanted it. I then installed the clamps at each end of the muffler. I rotated them so that the base of the clamp would face to the side. This gives maximum ground clearance and protects the ends of the bolts from damage.

Muffler clamped in palce - Jeep Cherokee
Muffler clamped in palce - Jeep Cherokee

With all the clamps in place, I removed the support and gave it a good shake to make sure it was positioned where I wanted it. I then lowed the Jeep and started the engine. I raised it back up and checked for leaks. Finding none, I was ready for a test drive.

Cat back system complete - Jeep Cherokee
Cat back system complete - Jeep Cherokee

The Dynomax system has a nice throaty rumble without being loud. I am very happy to have my exhaust gasses exiting from behind the Jeep again instead of from underneath.

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