Dynamax Rock Crawler Muffler - JKowners.com : Jeep Wrangler JK Forum
 
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post #1 of 4 Old 07-20-2012, 12:26 PM Thread Starter
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Dynamax Rock Crawler Muffler

Many thanks to Jacob at Black Rock Customs in Fredrick, MD.

Very easy install. Takes about an hour.


Tools needed:
-WD40
-White lithium grease
-Ratchet
-15mm socket
-Rubber mallet
-Cutting wheel
-Hack saw
-2 4" tube clamps
-Screwdriver
-Pry bar
-Beer


1) Using the 15mm socket and ratchet, loosen the bolt connecting the exhaust pipe to the OEM muffler. Hit that connection and the rubber connection/securing points on each side of the muffler with WD40.

2) Use a pry bar to disconnect the connection/securing points on each side of the muffler. Then twist the muffler back and forth, pulling the muffler free from the exhaust pipe. Discard the muffler.

3) Figure out where you want to place the new muffler and mark where you want to cut the exhaust pipe. I placed mine just in front of the evap canister.

4) Confirm placement and measurements.

5) Cut the exhaust pipe. I used a 4.5" cutting wheel and a small hack saw. I cut the pipe in two places thinking that I might want to use the back piece of the exhaust pipe.



6) Hit the rubber connection/securing point on the back portion of the exhaust pipe and remove using the pry bar.

7) Remove all the junk in the trunk.





8) Get your new muffler ready.



9) File down and burrs and hit the front exhaust pipe end with a little white lithium grease. Install your new muffler. A twisting motion will get it started, then use the rubber mallet to drive the muffler into place. ((Note: my sehaust pipe seemed more oval than round. I used a large pair of vice grips to kinda round it out.))







10) I used a 4" tube clamp to secure the muffler to the frame.







After driving around for a while I decided that the noise being concentrated right under me was going to be annoying. Needless to say, I was pretty happy that I decided to keep the back portion of the exhaust pipe.



11) File down any burrs and hit the end of the exhaust pipe with a little white lithium grease. Twist it into the other end of the new muffler. Secure the pipe using the OEM rubber mount. I used an additional 4" tube clamp on the other end of the muffler.









~~~~Consume beer as necessary


It's got a nice rumble to it. Much better after adding the back exhaust pipe. I have a MBRP skid on backorder. I'll add that to this thread later.

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post #2 of 4 Old 07-20-2012, 12:31 PM
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Nice. I have the same one (and same sliders too lol). Love my muffler. I downturned mine right after the muffler. It is louder but I wanted the space above the rear axle for an additional air tank that I still have to install.
Good write up.
Cheers.
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post #3 of 4 Old 07-20-2012, 05:46 PM
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I have the same one on my 2 door. love it. Kinda tight but like it.


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post #4 of 4 Old 07-26-2012, 01:10 PM
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Just for future reference, the muffler P/N used here is 17263.
Clamps 35337 but any good clamp should do.


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