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HOME1998 Jeep TJ SportMods/TechPlease find me at the forum if you have any questions!
Website Last Updated: 5/19/2008
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Michael can also be found in JeepForum.com and Jeepsunlimited.com under the user name 'Michael_K'.
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Exhaust Upgrade: Dynomax Super Turbo Muffler & Magnaflow Catalytic Converter 41+ pictures! The biggest write up yet!! ◆◆◇◇ Medium Introduction
Another search began for cat-back systems for Jeep TJ Wrangler but I have not found any write up on the exhaust upgrade for TJs. I only found many saying how they like their systems and how their exhaust systems are performing. That didn't help much with the install. There is nothing to compare different systems on the market. However after searching for a while, I found a few clips of the exhaust note of different system. Even so, I couldn't tell how loud they were.
After reading various articles/thread available online, I decided NOT to go with Banks and Borla. One of the reasons is that they are just plain out overpriced. A muffler and a piece of pipe made of stainless steel did not justiy $300 price tag. Also, I read many describing they sound farty and pretty loud. They did come with the limited lifetime warranty yet, there were other brands that also came with the lifetime warranty for less than a half of their price.
Warning 1. You need to cut some components to replicate my procedure. 2. You are working with large and heavy parts which is ackward to handle under the vehicle. Second set of hands is required for proper removal and adjustment during installation.
Tools & Parts Needed Socket Set O2 Sensor Removal Socket (Optional if you have a big monkey wrench) Floor Jack and Jack Stands(4) Dynomax Cat-Back System (~$130 from SummitRacing.com) Magnaflow Catalytic Converter Part# 23227 for 1997-1999 (~$80 from eBay) Preformed Band Clamps (qty. 2, 2.5" radius) Saw (Metal Cutting)
Job Hours 4 hours
Procedure
11. Place the band clamp provided with the Magnaflow catalytic converter on the down pipe.
13. Reinstall the transmission support bracket on the transmission. Make sure the cat support is installed through the bracket.
17. You should be able to remove all the jack stand now. Connect oxygen sensors. Reinstall the skid plate.
18. Tighten the down pipe to the header. Adjust the muffler and the cat so that it will clear the skid plate and the rear shock. If you don't do this right you will hear rattling when the engine is running. Tighten all the band clamps.
Additional Pictures of the Install
The Verdict
Overall, the sound is louder than I expected. Maybe this is because of the Magnaflow catalytic converter. It definitely has a bit more rumble than stock and around 2500 RPM, it gets dramatically louder. I guess this is where the system got "Turbo" in its name. I do notice the quiet rumble like V8 when idling. I really like that initial rpm spike when you start the engine and the sound caused by it. Jeep definitely sounds a lot more aggressive when I step on the skinny pedal but unlike the idle it is not that distinct V8 sound. It is more of a unique sound like no other exhaust systems that I have heard in deeper than ricers, but not as deep as V8.
After the install, my jeep went from 14-15 MPG to 16-17 MPG. I used to get around 210-230 miles per tank but now I am getting around 250 miles before the fuel warning light. That is like getting another extra gallon or two. In other words, it is like saving a gallon or two every tank. I also noticed that I am not on the skinny pedal as much as I used to be. I guess that can be translated as increase in power. Not the power you would notice but enough to save gas.
Am I pleased with the install? You bet. Increase in the MPG alone will pay for itself very soon considering near $3/gallon gas price. What is better than mod that pays for itself?!
After driving for about 500 miles the exhaust started rattling again. This happened because the clamps were not on tight. After readjusting and reclamping, the rattle was gone. Now I got over 1000 miles on the system with no rattle. If the rattle comes back again. I will readjust the clamp and add some thread lock to it.
If you have any questions or recommendations, please let me know!!
Disclaimer I tried my best to document as much as possible along with pictures. I hope you find them useful. However, do use the information provided here "as-is". Daily or the author does not warrant or assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, or process disclosed. Use the information at your own risk.
Written by Michael on 6.10.2006. |
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Jeep®, Wrangler, Liberty, Wagoneer, Cherokee,
and Grand Cherokee are copyrighted and trademarked to Daimler-Chrysler Corporation. All materials presented in DailyDrivenTJ.com should only be used for entertainment. :) DailyDrivenTJ.com does not warrant or assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, or process disclosed. DailyDrivenTJ.com
has DailyDrivenTJ.com is hosted by SiteGround.com Copyrighted © 2006 DailyDrivenTJ.com - All right reserved. |
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