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Old 07-22-2016, 01:06 PM   #1
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Removing Cats

This is my dumb question for the week.

I want to remove the cats from my H Pipe / mid pipe. The two in the rear look as if I can easily cut the pipe and replace the cats with a slip on pipe and clamps.

My concern is with the two upper / front cats. Has anyone been able to successfully remove those without screwing everything up?

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Old 07-22-2016, 03:13 PM   #2
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You will need a tune to tune it out or else the computer will try to force the engine to run clean (loosing major power) and probably rough idle

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Old 07-22-2016, 03:15 PM   #3
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You will need a tune to tune it out or else the computer will try to force the engine to run clean (loosing major power) and probably rough idle

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I should be able to turn off the O2 sensors with my handheld tuner. I could be wrong.

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Old 07-22-2016, 04:13 PM   #4
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I should be able to turn off the O2 sensors with my handheld tuner. I could be wrong.

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Yes there should be a setting to do that either get a an off road pipe like I did or go to a muffler shop and have them cut off right after the 02 sensors and have them weld in some pipe

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---------- Post added at 10:13 PM ---------- Previous post was at 10:12 PM ----------

Oh yeah and it's the rear 02 sensors that have to be turned off

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Old 07-22-2016, 05:09 PM   #5
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Removing Cats

Do it often at my shop. No issues.
Use a saw-zaw. When we use clamps we normally get them from Napa.

If one does not fail at times, then one has not challenged himself.
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Old 07-22-2016, 05:34 PM   #6
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Do it often at my shop. No issues.
Use a saw-zaw. When we use clamps we normally get them from Napa.

If one does not fail at times, then one has not challenged himself.
Thank you sir. I will pull the car into some ramps and take a look to see what I need.

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Old 07-22-2016, 05:40 PM   #7
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Yes there should be a setting to do that either get a an off road pipe like I did or go to a muffler shop and have them cut off right after the 02 sensors and have them weld in some pipe

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---------- Post added at 10:13 PM ---------- Previous post was at 10:12 PM ----------

Oh yeah and it's the rear 02 sensors that have to be turned off

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I would love an off road pipe. At the moment that is a cost I cannot justify. I have a blown engine in my truck, kids and school, I'm finishing a grad degree, and my studio business has taken a hit because I am not able to record live venues (I need the truck to haul my equipment).

Right now any and all modifications, repairs, etc are being done with used, scavaged, salvaged, or fabricated parts.

I am working on a true budget build.

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Old 07-22-2016, 05:48 PM   #8
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Just remember...it's illegal 😉
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Old 07-22-2016, 06:10 PM   #9
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Just remember...it's illegal 😉
Not at the track, or at shows, or on my property

Shhhhhhhhhhhh, no one will ever know.

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Old 07-22-2016, 07:22 PM   #10
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My concern is with the two upper / front cats. Has anyone been able to successfully remove those without screwing everything up?

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It depends on what your definition of not "screwing everything up" is...

Is there any emission testing in the area where you live?
If there is, do they perform a visual inspection as part of the test?
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Old 07-22-2016, 07:48 PM   #11
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You're in GA no one will ever notice the difference. With all the big diesels rolling coal, I think the last thing people worry about is my stinky exhaust.


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Old 07-22-2016, 08:05 PM   #12
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It depends on what your definition of not "screwing everything up" is...

Is there any emission testing in the area where you live?
If there is, do they perform a visual inspection as part of the test?
If there was emissions testing in my town no one would ever get a tag. There isn't a redneck anywhere around here with an emission system. I'm pretty sure there are more "illegal" lifted trucks running around than legal ones.

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Old 07-22-2016, 08:07 PM   #13
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Originally Posted by Slater2111 View Post
You're in GA no one will ever notice the difference. With all the big diesels rolling coal, I think the last thing people worry about is my stinky exhaust.


2003 GT: JLT CAI, summit 75mm TB, C&L plenum, 24# injectors, Mac Prochamber, SLP LM1 cat back, 3.73 Gears, FR500 Diff, FR500 diff cover, Jmod trans and shift kit, Max Motorsports subframes, Koni oranges front and rear, DBA discs front and rear, shrader performance rear seat delete, APSX D2 wideband, MPT happy customer.
Exactly Slater.

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Old 07-22-2016, 11:52 PM   #14
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Is there any benefit in removing the rear cats only?

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Old 07-23-2016, 04:58 AM   #15
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Is there any benefit in removing the rear cats only?

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It sounds throatier and technically there is a little power freed, but it's pretty negligible

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Old 07-23-2016, 07:46 AM   #16
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It sounds throatier and technically there is a little power freed, but it's pretty negligible

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Gotcha. Do it all, or don't do it.

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