UPDATE FOR 2012!!!!
Bottom of post....

So, I know the Dynomax system is a straight forward and simple install, however, I thought I would share what I did this afternoon for those who would like a visual and a simple write up of how to install the Rockcrawler Exhaust for the 4 door JK. Tool requirements are very minimal, a 15mm wrench and some WD40. I did end up using my breaker bar as pry bar which I will explain later.

All parts purchased from 4wd.com. Thanks for the help and free shipping BustaBizz!
https://www.jk-forum.com/forums/atta...hmentid=174994

Here is what we are working with...
https://www.jk-forum.com/forums/atta...hmentid=174990

First step is to lubricate all the rubber isolators that are holding the exhaust, as well as, the exhaust clamps on the OEM pipe.
https://www.jk-forum.com/forums/atta...hmentid=174987

Next, loosen the two exhaust clamps behind the catalytic converter and the one used to attach the muffler.
https://www.jk-forum.com/forums/atta...hmentid=174986

Then, remove the metal rod hangers from the rubber isolators (there are 4). These are definitely a pain in the ass to remove, I used my breaker bar as a pry bar for leverage.

After all hangers are removed, I found it easier to wiggle the muffler off first, then disconnect the middle section of the pipe. I was left with this to work with...
https://www.jk-forum.com/forums/atta...hmentid=174991

The next step was to slip on one of the 2 1/2" clamps provided and install the front intermediate pipe. Insert the rod hanger into the rubber isolator and slightly tighten the clamp.
https://www.jk-forum.com/forums/atta...hmentid=174988

Take the muffler and one of the larger 2 1/2" band clamps and attach it to the front intermediate pipe and slightly tighten to hold in place.
https://www.jk-forum.com/forums/atta...hmentid=174989

Do the same for the tailpipe, installing it into the outlet side of the muffler and slightly tightening the clamp. Be sure to insert the metal rod hangers into the isolators.
https://www.jk-forum.com/forums/atta...hmentid=174985
https://www.jk-forum.com/forums/atta...hmentid=174992

Finally, instal the tip on the outlet of the tailpipe, if desired.

At this point all there is left to do is to tighten all the clamps and aligning the system components beginning at the inlet.

I am very satisfied with the Dynomax system. Sounds great!

Hopefully this is helpful for those that need it!

Cheers :beer:

UPDATE
9/27/2011

So I just traded my original project 2008 Sahara Unlimited in for a 2012 Rubicon Unlimited. I swapped all my mods over to the Rubi including the Dynomax exhaust.

Here are a few pictures and thoughts about the Rock Crawler with the 3.6L

The sound is much louder and higher pitched compared to the 3.8L. Yes, there is a drone all the way through 6th gear but that doesn't bother me. However, I do expect the sound to change as the engine gets broken in, I don't even have 200mi on her yet. I will try to keep this updated as thing get broken in.

Now for the fit of the exhaust, it is much tighter and more snug to the tub and frame. In addition, the first rubber isolator for the exhaust hanger has been moved about 3 inches to the back so the exhaust losses a little support from the frame but is still very secure (more secure than my 08'). As you an see in the pictures the muffler and last section have little clearance from the tub, cross members and come pretty close to the spring perch.

Hope this helps for the 2012 owners!

Cheers

Done from my phone sorry for attachments!

More clearance?
 

Nice pictures and instructions. I've got a full compliment of skid plates and have had vibration issues with the stock exhaust. Does this one provide more clearance than your stock one did?

Clearance is the same because it uses the OEM isolators. The pipes hug the driver side frame and the muffler mounts in the middle of the frame rail.

Is there any "drone" going down the freeway? :thinking:

got any part number links? How does it sound?

I did not have to relocate the evap can. The exhaust took the same lines as the OEM.

I haven't noticed any drone at highway speeds when cruising, just a nice sound during acceleration. There is a significant sound difference between the stock exhaust. This system sounds great, nice deep and throaty.

Part# 39459
http://www.dynomax.com/application_i...r-design-39459

Maybe I will try and add a sound clip later on.

Please do try to add a sound clip at some point if you could. I'm very interested in this exhaust.

What a great write up!
Thanks for taking the time to show just how easy this system is to install.
As you mentioned the toughest part can be the hangers and some bolts that get stubborn.

Thanks again!

:beer:

2012 update 9/27/2011
 

Just swapped my mods from my 2008 Sahara Unlimited to my 2012 Rubicon Unlimited. Updated with pictures in original post!

Cheers

Thanks for the write up. Well done. :clap:
We will be supporting the 2012-forward with a new exhaust system, hopefully it will be launched the beginning of the 2012.
At that time I will put an announcement in the Vendor area. Thanks all for the PM's.

Is there any way to dump the exhaust before the back axle?

how is the power down low?

Check this link out.
https://www.jk-forum.com/forums/show...nstalled-VIDEO


You should see gains throughout the whole power band, but not too sure how much yet. We are working on the 2012 system now.

Great Write Up and Correspondence. Thanks. :beer:

I bought this same system for my 2011 Unl. rubi; the muffler that comes with it rested directly against the frame at the front of the muffler. I could see no way to adjust it down because its close behind the stock exhaust that stays where it is. I don't mean it was close to the frame; it was firmly pushing against the frame; a solid connection.
The other problem with this kit is the muffler that comes with it is very loud and drones like crazy.
The other problem with this kit is it exits straight out the back. I know it's supposed to be "high clearance" but a slight down turn would be much better to help get the exhaust gasses away from the Jeep.
I paid a muffler shop to put a quieter muffler on and they welded it in place so it doesn't hit anything like the muffler that comes with the kit.
I also tried to contact Dynomax on their web site and never got a reply.
Save yourself some money and just have a good local muffler shop fabricate you a system or buy another system; not reccomended.

Great Write Up!!
 

This was a very good write-up! The instructions included didn't help to much but it was an easy install thanks to this write up. The only problem was the tip that I got does not fit. It is way to big for the tailpipe. I email Dynomax tech support to send me a new one lets see how long it takes them to get back to me.




Black 2010 JKU Sahara 6 Speed | 2.5 TF Coil Lift w/ Shocks | 35x12.5x18 Toyo Open Country M/T | Rancho Steering Stabilizer | LoD Front Stubby bumper | Smittybilt XRC Rear Bumper w/ Tire Carrier | K&N CAI kit | Super Chip Flashpaq | Rugged Ridge Mats Front and Rear | Smittybilt Neoprene Seat Covers Front and Rear | Bestop Bikini Top | Smittybilt CRES | Cobra 75 cb w/ Firestik | Dynomax Ultraflo Rock Crawler Exhaust System | Poison Spyder Evap Skid

Often times with that tip you have to really tighten it down, a lot. FYI!