Installing Shorty 6.1L SRT8 headers on 5.7 - Jeep Commander Forums: Jeep Commander Forum
Exhaust Questions or advice about exhaust systems? This is the place...

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post #1 of 39 (permalink) Old 12-26-2014, 08:36 AM Thread Starter
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Installing Shorty 6.1L SRT8 headers on 5.7

Ok, I am at an impasse right now trying to figure out a balance for power and sound.
I will be installing my SRT8 shorty headers this week with the flow master midpipes w/cats. I am keeping the twin 3" tube setup.
So... Use a 3" twin inlet muffler with twin 3" outlets, the a second (optional) muffler for a resonator before I exit out back. Similar to the gibson srt WK setup, just not exiting middle bumper.

I was wondering if the 44 from flowmaster would be too loud for neighbors and go with the 50 instead. I want the added power but I do not want a commander as loud as a Harley.

Dave

'06 Hemi Limited 4X4, 6(ish)" lift, 35" General Red Letter, 2" spacers, Mopar CAI, RER and mygig lockpick, blue Interior LEDs, stub antenna 3", Callahan Red Brake set, 6.1L SRT8 exaust headers, full custom 3" exhaust from headers back, Fastman 847 ported TB, BBK Fuel Rails, 6.1L injectors, JBA UCAs, Nitro gear 4:10, SA hidden front winch mount.

Last edited by Mk153smaw; 01-11-2015 at 11:57 AM.
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post #2 of 39 (permalink) Old 01-01-2015, 09:47 PM Thread Starter
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Update: I am going with a Lawson Industries 3" dual in and out 14x22". I am heading down to the exhaust shop tomorrow to coordinate some mods work to the midpipes. The magnaflow midpipes need to have the mounting flange "clocked" a bit to match up with the SRT8 headers. I have two flanges that meet up in a perfect X pattern...ugh.
Pictures coming and a before/after sound clip to add to the exaust sounds thread if anyone wants to do this setup.
Srt8 headers $150
Magnaflow midpipes $400 with cats
Lawson muffler $45 (got a discount)
Pipe work (unkown yet)

'06 Hemi Limited 4X4, 6(ish)" lift, 35" General Red Letter, 2" spacers, Mopar CAI, RER and mygig lockpick, blue Interior LEDs, stub antenna 3", Callahan Red Brake set, 6.1L SRT8 exaust headers, full custom 3" exhaust from headers back, Fastman 847 ported TB, BBK Fuel Rails, 6.1L injectors, JBA UCAs, Nitro gear 4:10, SA hidden front winch mount.
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post #3 of 39 (permalink) Old 01-04-2015, 10:09 PM Thread Starter
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Well, this weekend was a complete poop for installation. The shop I was going to use just didn't give me a warm and fuzzy when it came to getting the job done. I am a big fan of talking with a shop before I contract them to do any work to get a feel for what I am giving my good money for.
First off, they ask why I am even doing an exhaust for a SUV (why bother? was his second question). Then they proceed to offer the flow master 10 series as the most likely best product for my truck (they assume I must have cut my mullet for a job interview and enjoy having the loudest vehicle on the planet).
SO I play along and ask him what kind of lead time he would need to set up a install... None, just drive in when I need it (how likely will he not be busy the day I need it?)
Since I will be installing new headers (he cannot do it), I ask if he has a tow service he works with to transport to his shop modify the mid pipes for install and complete the system... He told me to drive it with open headers, proceeds to tell me how many open pipe systems he recently installed on mustangs and challengers that should be legal.
Could be legal, but I will not even try that option... I like my neighbors and not rocking the town.

I am buying a new welder to modify the pipes myself next weekend. I figure I suck at welding, but I should be able to tack them in place so I can have one of my weld guys at work clean it up.
I try not to use my employees at work to do my work since it is really frowned upon, but I think this one time may be ok.

Dave

'06 Hemi Limited 4X4, 6(ish)" lift, 35" General Red Letter, 2" spacers, Mopar CAI, RER and mygig lockpick, blue Interior LEDs, stub antenna 3", Callahan Red Brake set, 6.1L SRT8 exaust headers, full custom 3" exhaust from headers back, Fastman 847 ported TB, BBK Fuel Rails, 6.1L injectors, JBA UCAs, Nitro gear 4:10, SA hidden front winch mount.
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post #4 of 39 (permalink) Old 01-11-2015, 12:06 PM Thread Starter
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Went back and edited the title to this thread to make more sense and easier to find once I am done.

I have found only one other thread for doing this, but it was about modding the WK 5.7 for the shorty's. The thread I found is awesome and has good pictures for the header install. I am going to ad to it, and any adjustments, for the XK.
The link:
http://www.jeepsunlimited.com/forums...olds-on-a-5-7L

I will try to ease removal of the 5.7 log headers by removing the wheel wells, after comment from original poster that indicated it would make things easier, and post some pics on the difference easier vs harder etc...

Then I will continue the install thread with the 3" mid-pipe from magnaflow all the way back to the tail pipe. I am hoping to have a dual 3" into the 22" muffler and exit with twin 2.5" pipes following the OE exhaust path.
3" twin pipes are too big to go all the way back, but 2.5 might just fit with some creative bending/welding.

Dave

'06 Hemi Limited 4X4, 6(ish)" lift, 35" General Red Letter, 2" spacers, Mopar CAI, RER and mygig lockpick, blue Interior LEDs, stub antenna 3", Callahan Red Brake set, 6.1L SRT8 exaust headers, full custom 3" exhaust from headers back, Fastman 847 ported TB, BBK Fuel Rails, 6.1L injectors, JBA UCAs, Nitro gear 4:10, SA hidden front winch mount.
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post #5 of 39 (permalink) Old 01-16-2015, 02:15 AM Thread Starter
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Part one completed! Removed old logs from the motor. What a pain in the butt, 3 busted bolts. At least on the broken bolts it was just the head and much of them remain. I am going to douse them with go ol' PB blaster overnight.



'06 Hemi Limited 4X4, 6(ish)" lift, 35" General Red Letter, 2" spacers, Mopar CAI, RER and mygig lockpick, blue Interior LEDs, stub antenna 3", Callahan Red Brake set, 6.1L SRT8 exaust headers, full custom 3" exhaust from headers back, Fastman 847 ported TB, BBK Fuel Rails, 6.1L injectors, JBA UCAs, Nitro gear 4:10, SA hidden front winch mount.
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post #6 of 39 (permalink) Old 01-16-2015, 08:17 AM
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Thanks for sharing, this is an interesting project. Hope you post a video, I'm dying to hear how it sounds. Good luck with the rest of the build!
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post #7 of 39 (permalink) Old 01-16-2015, 02:27 PM Thread Starter
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Ok, passenger side on now...

Talk about holy cow!! I had to beat the manifold flat on one of the header pipes to fit against the frame. That took over an hour of super hammer

Picture to come, letting phone recharge.

Right now I have removed the front drive shaft to get room to attempt the drivers side. I am already fearing the steering shaft. I may have to try and modify the mount, but first I need to figure out how to slide the header in first.

Dave

'06 Hemi Limited 4X4, 6(ish)" lift, 35" General Red Letter, 2" spacers, Mopar CAI, RER and mygig lockpick, blue Interior LEDs, stub antenna 3", Callahan Red Brake set, 6.1L SRT8 exaust headers, full custom 3" exhaust from headers back, Fastman 847 ported TB, BBK Fuel Rails, 6.1L injectors, JBA UCAs, Nitro gear 4:10, SA hidden front winch mount.
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post #8 of 39 (permalink) Old 01-16-2015, 02:37 PM Thread Starter
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'06 Hemi Limited 4X4, 6(ish)" lift, 35" General Red Letter, 2" spacers, Mopar CAI, RER and mygig lockpick, blue Interior LEDs, stub antenna 3", Callahan Red Brake set, 6.1L SRT8 exaust headers, full custom 3" exhaust from headers back, Fastman 847 ported TB, BBK Fuel Rails, 6.1L injectors, JBA UCAs, Nitro gear 4:10, SA hidden front winch mount.
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post #9 of 39 (permalink) Old 01-16-2015, 03:32 PM Thread Starter
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Join Date: Dec 2014
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Well I have met with faiure with these headers. 6.4L headers will not fit

Passenger side can be done, but the driver side must be installed with the motor out of the vehicle and even then you must modify the steering mount by 1" into the fender away from header.

That really sucks!

I have to run out to the dealership now and get some oem studs so this vehicle can make the exhaust pipes tomorrow maybe and drive Monday.

The only SRT8 headers I know tat might work are the 6.1L 2006-2011 style shown in the earlier thread link.
I need to try and buy some of those and try again later. Must get the grocery getting working again!

Dave

'06 Hemi Limited 4X4, 6(ish)" lift, 35" General Red Letter, 2" spacers, Mopar CAI, RER and mygig lockpick, blue Interior LEDs, stub antenna 3", Callahan Red Brake set, 6.1L SRT8 exaust headers, full custom 3" exhaust from headers back, Fastman 847 ported TB, BBK Fuel Rails, 6.1L injectors, JBA UCAs, Nitro gear 4:10, SA hidden front winch mount.
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post #10 of 39 (permalink) Old 01-16-2015, 04:26 PM Thread Starter
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Join Date: Dec 2014
Location: East Meadow, NY
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Current Mileage: 120000
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Garage
Yup, the new WK have a high flow cast header on th SRT8. I am going to ebay these adtry again next month. I am still going to put on the 3" magnaflow midpipes now to pre stage my system for the headers

Dave

'06 Hemi Limited 4X4, 6(ish)" lift, 35" General Red Letter, 2" spacers, Mopar CAI, RER and mygig lockpick, blue Interior LEDs, stub antenna 3", Callahan Red Brake set, 6.1L SRT8 exaust headers, full custom 3" exhaust from headers back, Fastman 847 ported TB, BBK Fuel Rails, 6.1L injectors, JBA UCAs, Nitro gear 4:10, SA hidden front winch mount.
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