I tried to search but couldn't find any topics about full exhaust replacement / modification....

I have a 2002 that seems to have a cat failing and other pipes getting weak...not sure if I should replace one cat, all 3 or upgrade my whole system.

Anyone change their system, cats and all? Mangaflow lists all 3 cats and a muffler. Would going OE be better?

Also, I plan on keeping the Jeep....as long as I can. It's my daily driver with 172K on it now.

For the cats, just stick with OE. For the rest, you can install an aftermarket muffler but the rest of the piping I'd just stick with something as close to OE as possible.

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Originally Posted by m_volyrakis
"I recently removed my girlfriend.
Although this mode didn't affect my ground clearance, it drastically improved my off-road capabilities!"

I had the hi flo cats and cat back exhaust from magnaflow welded in a little over 10 years ago... Haven't had one issue yet... Love the way it sounds at all speeds woke her up a little bit as well...

On my 05 CRD, I ditched the CAT, put in a straight piece of 2.5 pipe and replaced muffler with a Flowmaster, picked up some power, and sounds great to boot!

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Supporting Vendor and Moderator of LOST
05 Jeep Liberty CRD Limited
Ironman Springs/Bilstein/Shocks
Yeti StgIV Hot Tune
Week's BatteryTray
No FCV/EGR
Samcos/ProVent
SunCoast/Transgo
Carter Intank-pmp
2mic.Sec.Fuel Filter
Flowmaster/NO CAT
V6Airbox/noVH
GM11 Bld.fan/HDClutch
IronrockArms/wwdieselMount
98 Dodge Cummins 24 Valve

Ended up going OE - wasn't exactly cheap, but back in business and passed inspection....replaced all 3 cats (one was bad and the y-pipe between the front two and the rear was rotted through). Sold from Chrysler as one part number.

I run a 3 inch pipe from the turbo to a magnaflow muffler and then 3 inch dumps out of the back


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You can piece it all together at NAPA for pretty cheap


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How about you CRD guys look at what the OP vehicle is 1st before posting,almost nothing compares between the CRD and gasser KJ's besides suspension,t-case,F/R axles, and brakes,all else in the driveline is completely different.


For the OP OEM is the best and yes costs more but for a reason,those cats are 50 state legal while all others are not.Those aftermarket cats are only about 30%-60% as efficient as the OEM cats.Oh and the OEM cats are the highest flowing cats on the market,and they work also,even in CA.

Glad I went with them, then. About to hit 175K on it.....here's to 175 more....

I love my Magnaflow cat back system. Good to know that if I replace the cat that the OE is the way to go, Thanks for the info. Keep on truckin

I concurr. My six year old Magaflow catback set up did the same for my Liberty. Glad I spent the $$.

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2005 Sport, Light Khaki, manual trans 6 speed, front spacer lift, tinted glass, tow hooks, ProComp black rock crawler rims, Toyo AT tires, K+ N filter charger, Magnaflow muffler, Bilstein shocks, Daystar sway bar bushings, skid plates, trailer hitch, fogs, 50 watt back up bulbs, Sylvania plus headlights, Thule rack and SiriusX Satellite radio.