C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Removing cat converter

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Old Apr 29, 2003 | 02:15 PM
  #1  
sprangsplaya's Avatar
sprangsplaya
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Default Removing cat converter

I heard this was illegal but if I removed it would it provide more horsepower for my 91.
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Old Apr 29, 2003 | 03:16 PM
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Default Re: Removing cat converter (sprangsplaya)

Yeah 3 whole horsepower :crazy:

It's illegal and the fine is huge if you get caught.
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Old Apr 29, 2003 | 09:04 PM
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Default Re: Removing cat converter (sprangsplaya)

Not that I ever would remove mine :D
But If Iwas to come across a cat converter delete pipe that bolted right in and could re-install the main cat for inspections. It sure would (speculation mind you) make a difference in performance, and sounds so much sweeter through the 40 series flowmasters on the back. :cool:

:seeya
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Old Apr 29, 2003 | 10:16 PM
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Default Re: Removing cat converter (Rays91L98)

Not that I ever would remove mine :D
But If Iwas to come across a cat converter delete pipe that bolted right in and could re-install the main cat for inspections. It sure would (speculation mind you) make a difference in performance, and sounds so much sweeter through the 40 series flowmasters on the back. :cool:

:seeya

I've "heard" that a better way to do it is to have a piece of 3" pipe welded inside the converter housing. Bolt it back up and no one will ever know unless they do a sniff test.
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Old Apr 29, 2003 | 11:10 PM
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Default Re: Removing cat converter (flyersfan1088)

Not that I ever would remove mine :D
But If Iwas to come across a cat converter delete pipe that bolted right in and could re-install the main cat for inspections. It sure would (speculation mind you) make a difference in performance, and sounds so much sweeter through the 40 series flowmasters on the back. :cool:

:seeya


I've "heard" that a better way to do it is to have a piece of 3" pipe welded inside the converter housing. Bolt it back up and no one will ever know unless they do a sniff test.
They do a sniff test if you are pulled over for an infraction here in Fairfax if they have reason to believe you are running catless. Not worth the possible fines to me. I ran my 91 at different times with a clogged cat, hollowed cat and a Randon Technology cat. Big difference when i hollwoed the clogged cat. Almost no difference after installing a Random cat.
Guees you need to ask yourself, is it worth the extra 3HP? :leaving:


[Modified by ConeKLR, 11:13 PM 4/29/2003]
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