FlowMaster 50 series with no cat??? - North American Grand Cherokee Association

ZJMike · 07-24-2002, 05:18 AM

A friend of mine just had the 50 series FlowMaster taken off of his ZJ and offered me a pretty good deal on it. Another person had suggested taking the cat off my ZJ when installing the muffler for a little more umpf. Would there be any adverse effects?? I live in Kansas, so emissions laws are not really a big deal. Will having my cat removed make the exhaust any louder than if I only added the muffler??

Thanks a lot guys,
Mike

Bender · 07-24-2002, 10:19 AM

it will be so loud that you will set off alarms when you drive by or on start up.

you may also loose a bit on the low end because of the less restriction.

i have a 70 with no cat(couldnt afford it yet) and i will get the carsound soon.

bullitt210 · 07-25-2002, 06:30 AM

I would think that this would cause problems with the OBD II system....
-c

Austin ZJ · 07-28-2002, 09:01 AM

Taking out the cat will definitely mess things up. The computer won't know what's going on, and will cause the engine to run like crap.

As far as mufflers go, I just ordered a dynomax super-flo for my 5.2.

There's a great sound comparison using a 5.2 Durango at:
http://www.dynomax.com/sounds.stm

Bender · 07-28-2002, 09:23 AM

what year is your jeep?

i have a 95 w/ no cat and it runs great.

Austin ZJ · 07-28-2002, 09:53 AM

Mine's a 97. hmm. You also running a 5.2?

The way I understand it, the problems come in because there's an o2 sensor before the cat, and another after. If the computer doesn't read what it expects, it tries to adjust to get the correct emissions and louses things up.

Bender · 07-28-2002, 10:13 AM

i have the 5.2 but with only one o2 before the cat. they make a kit to trick the o2. http://www.quickd.com/misc.htm .

mike

07-24-2002, 05:18 AM	#1
ZJMike Senior Member Grand Junkie Join Date: Apr 2002 Location: Lawrence, KS Posts: 251	FlowMaster 50 series with no cat??? A friend of mine just had the 50 series FlowMaster taken off of his ZJ and offered me a pretty good deal on it. Another person had suggested taking the cat off my ZJ when installing the muffler for a little more umpf. Would there be any adverse effects?? I live in Kansas, so emissions laws are not really a big deal. Will having my cat removed make the exhaust any louder than if I only added the muffler?? Thanks a lot guys, Mike

07-25-2002, 06:30 AM	#3
bullitt210 Member Grand Rookie Join Date: Jul 2002 Location: Lewisville, TX Posts: 46	I would think that this would cause problems with the OBD II system.... -c __________________ '97 ZJ 4.0 2WD H&R Sport Springs, Power Stop Cross-Drilled Rotors F/R, Custom FIPK, 275/60R15's More to come whenever my wife lets me..... Kolak system is on the way!!!!

07-28-2002, 09:01 AM	#4
Austin ZJ Junior Member Grand Rookie Join Date: May 2002 Location: Atlanta, GA Posts: 9	Taking out the cat will definitely mess things up. The computer won't know what's going on, and will cause the engine to run like crap. As far as mufflers go, I just ordered a dynomax super-flo for my 5.2. There's a great sound comparison using a 5.2 Durango at: http://www.dynomax.com/sounds.stm __________________ Jeep 3:18

07-28-2002, 09:53 AM	#6
Austin ZJ Junior Member Grand Rookie Join Date: May 2002 Location: Atlanta, GA Posts: 9	Mine's a 97. hmm. You also running a 5.2? The way I understand it, the problems come in because there's an o2 sensor before the cat, and another after. If the computer doesn't read what it expects, it tries to adjust to get the correct emissions and louses things up. __________________ Jeep 3:18

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07-24-2002, 10:19 AM	#2
Bender Senior Member Grand Addict Join Date: Feb 2002 Location: savannah Posts: 726	it will be so loud that you will set off alarms when you drive by or on start up. you may also loose a bit on the low end because of the less restriction. i have a 70 with no cat(couldnt afford it yet) and i will get the carsound soon.

07-28-2002, 09:23 AM	#5
Bender Senior Member Grand Addict Join Date: Feb 2002 Location: savannah Posts: 726	what year is your jeep? i have a 95 w/ no cat and it runs great.

07-28-2002, 10:13 AM	#7
Bender Senior Member Grand Addict Join Date: Feb 2002 Location: savannah Posts: 726	i have the 5.2 but with only one o2 before the cat. they make a kit to trick the o2. http://www.quickd.com/misc.htm . mike

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