I hope Bogus doesn't see this 
Eliminating Cats
Thread Starter
Safety Car
Joined: Jul 2001
Posts: 4,871
Likes: 15
From: Detroit's West Side MI
Eliminating Cats
What's the best way to eliminate the cats on a 1993? Does anyone make a decent X or H pipe to bridge the gap between the headers and the cat-back exhaust (if it matters, I have a Borla system).
Any suggestions would be appreciated.
Thanks.
Any suggestions would be appreciated.
Thanks.
Burning Brakes
Joined: Apr 2000
Posts: 980
Likes: 2
From: Chandler AZ
Mine just has short pipes that hook up between where the cats would be and the headers. They have a flange welded on the outlet end and hook to the headers on the inlet. This just ensures that if I want I can put the cats back on with ease. Most muffler shops will make a "test pipe" like that for you.
Team Owner
Joined: Aug 2000
Posts: 40,156
Likes: 45
From: San Pedro CA
Glad I didn't disappoint.
I am curious, why do you want to ditch the cats?
They don't rob power... modern cats are most efficeint. Factory LT1 cats are only robbing about 5hp.
Here is the other part of the equation - cats provide necessary back pressure to allow the exhaust to scavange correctly.
The final part? Air quality. As long as a car is used on the highway, I will support the use of cats and EGR to keep emissions down. (note on the EGR, modern engines don't use it thanks to different cam overlaps and better computer controls)
I am a realist - precats and airpumps are a waste of space... If I could, I would ditch both off of bastet44's 87 coupe. But the main cat and the EGR are what really matter to air quality.
Headers only eliminate the factory cats. They are so big, they won't move down the car without bumping things. I would suggest bullet cats from Magnaflow (CarSound) or Random Technologies. Either way, they are about $140.00 each or so.
Is this car going to be a dedicated track car? If so, then you won't need them, and you can ignore my rantings.
I am curious, why do you want to ditch the cats?
They don't rob power... modern cats are most efficeint. Factory LT1 cats are only robbing about 5hp.
Here is the other part of the equation - cats provide necessary back pressure to allow the exhaust to scavange correctly.
The final part? Air quality. As long as a car is used on the highway, I will support the use of cats and EGR to keep emissions down. (note on the EGR, modern engines don't use it thanks to different cam overlaps and better computer controls)
I am a realist - precats and airpumps are a waste of space... If I could, I would ditch both off of bastet44's 87 coupe. But the main cat and the EGR are what really matter to air quality.
Headers only eliminate the factory cats. They are so big, they won't move down the car without bumping things. I would suggest bullet cats from Magnaflow (CarSound) or Random Technologies. Either way, they are about $140.00 each or so.
Is this car going to be a dedicated track car? If so, then you won't need them, and you can ignore my rantings.
Last edited by bogus; Mar 10, 2005 at 05:53 PM.
Melting Slicks
Joined: Nov 2002
Posts: 2,471
Likes: 2
From: 1993 Quasar Blue 'vert Scottsdale AZ
Originally Posted by VAHROOM
Mine just has short pipes that hook up between where the cats would be and the headers. They have a flange welded on the outlet end and hook to the headers on the inlet. This just ensures that if I want I can put the cats back on with ease. Most muffler shops will make a "test pipe" like that for you.
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