Novak Conversions Jeep Wrangler TJ engine mounts

Removing cats

JEEPSTEVENANAIMO

JEEPSTEVENANAIMO

TJ Enthusiast
Original poster
Joined
May 9, 2024
Messages
521
Location
nanaimo BC canada
ok so, found out i got a clogged upper cat. i refuse to pay the money for the new ones (Sucks to be canadian when it comes to prices)

have heard a 4.0 with only the last cat and a hushpower muffler and it sounded amazing.

however never had a chance to talk to him.

question for the masters on here, 1) will removing the cats help with the heat soak? (i have the heat shieldkit) 2) if i keep the third cat would i still get a check engine light? if so i assume just a tuner from that thread to get rid of it? or just live with it?
 
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JEEPSTEVENANAIMO said:
question for the masters on here, 1) will removing the cats help with the heat soak? (i have the heat shieldkit) 2) if i keep the third cat would i still get a check engine light? if so i assume just a tuner from that thread to get rid of it? or just live with it?
Click to expand...

No experience with Canadian emissions laws.

1. Possibly. You're removing a heat source.

2. No check engine light if you install all the O2 sensors (and they're working. That might take welding in bungs. Or yes, HP Tuners, take the emissions class to unlock the feature and do as you please.

I have a 97...IMHO it's the best exhaust. Single manifold...I'm using Banks...to a single downpipe wrapped around the oil pan to one cat beside the transmission and transfer case.

You could buy 97-98 parts and weld in bungs for the extra O2s.

-Mac
 
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macleanflood said:
No experience with Canadian emissions laws.

1. Possibly. You're removing a heat source.

2. No check engine light if you install all the O2 sensors (and they're working. That might take welding in bungs. Or yes, HP Tuners, take the emissions class to unlock the feature and do as you please.

I have a 97...IMHO it's the best exhaust. Single manifold...I'm using Banks...to a single downpipe wrapped around the oil pan to one cat beside the transmission and transfer case.

You could buy 97-98 parts and weld in bungs for the extra O2s.

-Mac
Click to expand...

I was actually wondering if that one piece manifold would work for my 04. thanks for that tip. ill grab one of those and than have a shop do the rest.
 
macleanflood said:
No experience with Canadian emissions laws.

1. Possibly. You're removing a heat source.

2. No check engine light if you install all the O2 sensors (and they're working. That might take welding in bungs. Or yes, HP Tuners, take the emissions class to unlock the feature and do as you please.

I have a 97...IMHO it's the best exhaust. Single manifold...I'm using Banks...to a single downpipe wrapped around the oil pan to one cat beside the transmission and transfer case.

You could buy 97-98 parts and weld in bungs for the extra O2s.

-Mac
Click to expand...

can get this one for $300 cad.


1721334117661.png
 
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JEEPSTEVENANAIMO said:
Inline 6 with the right exhaust sounds incredible. however most of the modern world thinks only the LS engine can sound good for some reason (barf)
Click to expand...

That is true....I removed all 3 cats on my jeep and it doesn't sound too bad...little raspy but sounds far better than a straight up sewing machine


Interested in how you get the CEL to go away though
 
TJuser said:
That is true....I removed all 3 cats on my jeep and it doesn't sound too bad...little raspy but sounds far better than a straight up sewing machine


Interested in how you get the CEL to go away though
Click to expand...

i havent done it yet, my buddy who has it used 02 "defoulers" basically an 02 sensor mount that is an elbow. tricks it into thinking its there or something. i used them on a supercharge cobalt back in 2007 and they worked for that.
 
JEEPSTEVENANAIMO said:
i havent done it yet, my buddy who has it used 02 "defoulers" basically an 02 sensor mount that is an elbow. tricks it into thinking its there or something. i used them on a supercharge cobalt back in 2007 and they worked for that.
Click to expand...
Ah so like a spacer. I want to do that but being where I am, the sensor and bung have rusted into unity.

Not to derail but those cobalts are stinkin fast...my buddy has one tuned and it'll take a gt3rs off the line
 
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TJuser said:
Ah so like a spacer. I want to do that but being where I am, the sensor and bung have rusted into unity.

Not to derail but those cobalts are stinkin fast...my buddy has one tuned and it'll take a gt3rs off the line
Click to expand...

theres a good reaosn they were the fastest fwd around the nurburgring for a long ass time. i still have one but its p
L J said:
IMO, a Jeep 4.0 can't sound incredible.

View attachment 543800

That's a far cry from "incredible". :LOL:
Click to expand...

No idea what his sounds like but the one ive heard was about the best ive ever heard one sound.

i prefer german engines when it comes to sound and power. but than again i work for a german brand lol
 
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