5.7 Hemi Exhaust Upgrade - Jeep Commander Forums: Jeep Commander Forum
Exhaust Questions or advice about exhaust systems? This is the place...

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post #1 of 17 (permalink) Old 09-08-2018, 03:38 AM Thread Starter
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Join Date: Aug 2017
Location: Edmonton, Alberta Canada
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5.7 Hemi Exhaust Upgrade

I have been listening to an ever worsening exhaust leak since I bought it. One broken passenger stud became two followed by a blown gasket. A few weeks ago the driver's started leaking. Couldn't stand it anymore. I bought some headers last year hoping they would work.

After taking apart a lot of under the hood quagmire, the skid plate, transmission cross member and cat y pipe, my brother and **** remover extrordinaire began taking out the studs and bolts that remained. Once he got the manifolds off, he removed the 4 broken ones. We then tried to fit the passenger header. Unfortunately the collectors are massive at 3.5" and almost 5" at the flange so it hit the frame. I saw two SRT8 Grand Cherokee being parted locally so I inquired about the manifolds. Ballony eating turds wanted me to buy the engines to get them. A local wrecker didn't have any but gave me the number of a US wrecker that did. Guy was awesome. Pulled them, gave me deal and shipped them same day. Now I just need to wait for them to arive.

We noticed that the muffler was leaking too so I purchased a Flowmaster 70 from a local speed shop. I hate drone because I am getting old so I didn't want to run a Super44. I was going to leave the resonator but hearing the Super44 audio clips posted I think I can cut it off with the 70 series being substantially quieter. I will update the progress once I get the SRT manifolds.
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post #2 of 17 (permalink) Old 09-08-2018, 04:20 AM
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Join Date: Aug 2018
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Good luck with your upgrade... I just wish everything was that easy here in Europe... There are not so many wreckers here to sell Jeep parts, so obtaining used spare parts is usually a nightmare...

Just noticed you live in Canada... Well, still better than Europe...
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post #3 of 17 (permalink) Old 09-08-2018, 02:15 PM Thread Starter
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Join Date: Aug 2017
Location: Edmonton, Alberta Canada
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Thanks bud. Maybe not for too much longer if the costume wearing sub 50 IQ piece of garbage pretending to be Prime Minister keeps wrecking the economy and insulting our allies.

Keep your eye on Ebay if you are interested. They come up occasionally and some wreckers have no issues shipping.
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post #4 of 17 (permalink) Old 09-12-2018, 02:45 AM Thread Starter
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Join Date: Aug 2017
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My SRT manifolds showed up today. Finished the front suspension today so hopefully exhaust tomorrow.
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post #5 of 17 (permalink) Old 09-13-2018, 01:34 AM Thread Starter
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Join Date: Aug 2017
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A bit of a disappointment. Three inches of snow outside. Never seen it this cold this early in my time. If some piece of garbage tried to talk about Global Warming bull**** to me, I would stomp his ass and ram his face in this crap. I was able to strip all the surface rust of the manifolds but that was it.:mad
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post #6 of 17 (permalink) Old 09-13-2018, 01:42 PM
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A bit of a disappointment. Three inches of snow outside. Never seen it this cold this early in my time. If some piece of garbage tried to talk about Global Warming bull**** to me, I would stomp his ass and ram his face in this crap. I was able to strip all the surface rust of the manifolds but that was it.:mad
Hang in there brother. Good things come to those who wait.


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post #7 of 17 (permalink) Old 09-20-2018, 06:50 PM Thread Starter
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A bit of an update.

Weather is still brutally cold. Pretty scary consideting it is still summer.

Got the passengers SRT8 manifold up without much issue. The driver's side is a different story. Who ever said it was an easy fit must have had a shop do it so has no clue. The wiring harnesses for the starter etc. are literally sitting against the header and are stretched so tight that there is no slack. We are considering pulling them and adding some length so that they can be re routed away from the manifold. If it was at least warm, it wouldn't be so painful.

To make matters worse, my brother went to fire up his Durango on Saturday and it appears to have thrown a connecting rod. I drove it on Friday with no issue. Now we are looking for a replacement motor for it to do a swap.
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post #8 of 17 (permalink) Old 09-21-2018, 08:47 AM
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A bit of an update.

Weather is still brutally cold. Pretty scary consideting it is still summer.

Got the passengers SRT8 manifold up without much issue. The driver's side is a different story. Who ever said it was an easy fit must have had a shop do it so has no clue. The wiring harnesses for the starter etc. are literally sitting against the header and are stretched so tight that there is no slack. We are considering pulling them and adding some length so that they can be re routed away from the manifold. If it was at least warm, it wouldn't be so painful.

To make matters worse, my brother went to fire up his Durango on Saturday and it appears to have thrown a connecting rod. I drove it on Friday with no issue. Now we are looking for a replacement motor for it to do a swap.
Based on your description of how the wiring harness is sitting Flex, you pretty much have to try and add some length to it, or, see if you can possibly find a replacement harness; a replacement harness might come with longer wires - but I have no idea what that might cost.

That being said, you definitely can't leave it as is.

Sorry about your brother's ride.


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post #9 of 17 (permalink) Old 09-22-2018, 02:53 AM Thread Starter
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Join Date: Aug 2017
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We pulled it out completely. My brother thinks if we re route it under the engine mount that it will take a shorter path and leave some slack. Worst case, three wires would need to be lengthened.

Installed the driver's today. Tomorrow I will reassembled the engine bay while my brother cuts and splices my cat pipes and welds the new Flowmaster to mid section.

We found a low km 2008(27k miles) hemi but he wants $3250. Might just get a stroker kit instead although the cheap one I saw a few months ago is gone.
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post #10 of 17 (permalink) Old 09-24-2018, 12:11 AM Thread Starter
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Join Date: Aug 2017
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I stripped the loom off the harness and all the tape and rewrapped it stretching the separation points. I put a fresh loom on it and wrapped it in some Percy's heat reflection tape. I then ran it under the engine mount and it reached everything with ease and is about 2 inches away from the header.

My brother sliced off a section of the cat pipe and we were shocked to find it was a pipe within a pipe. The inner pipe was only 2.25". To come even close to splicing it to the new headers, he cut it of flush with the cats. So at least that portion will be new stainless 2.5" pipe. What a stupid setup.
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