Hollowing/Removing Cats? - TCCoA Forums
 
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post #1 of 10 (permalink) Old 12-10-2010, 10:36 AM Thread Starter
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Hollowing/Removing Cats?

Well I was wondering what are the pros and cons of doing this?

1995 Cougar Xr7 4.6

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http://forums.tccoa.com/showthread.php?t=132847
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post #2 of 10 (permalink) Old 12-10-2010, 10:56 AM
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Pro: none
Con: Check engine light

In my opinion, if you are going to replace or remove the factory catalysts, put some high flow cats in there. They are not that much of a restriction and you won't be harming the environment. I don't mean to sound like an eco-freak, but I prefer to be responsible when it comes to things like this.

Michael M. ASE P2 Automobile Parts Specialist.

1996 Thunderbird LX. Gone, but not forgotten Oct 1995-March 24 2016 Trick Flow headded, E85 guzzling beast.

1985 Mustang GT. modified stock Holley 4180C, Weiand Street Warrior intake manifold, equal length headers, true dual exhaust, 5 speed, 3.55:1 8.8'' rear end, Ford Racing 10.5" clutch.

1998 Mustang GT premium. Trans Go shift kit, Bassani catted x-pipe, PI heads, cams, intake swap, Accufab elbow, SCT Xcal 4 tune, Eibach Pro-kit, Maximum Motorsports Caster/camber plates, fat tires. Banging audio system.

Last edited by Mgino96tbird46; 12-11-2010 at 01:05 AM. Reason: incorrect info- my bad
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post #3 of 10 (permalink) Old 12-10-2010, 04:24 PM
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pros, not much

cons, poor gas milage, check engine light, failed emissions testing, reduced performance, also on some cars hollowing the cats make a bad smell and makes your exhaust sound like crap.

get some high flows or remove the 3rd cat or both

third birds the charm.. I HOPE
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post #4 of 10 (permalink) Old 12-10-2010, 05:20 PM Thread Starter
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okay thanks. So will a high flow cat cause a decrease in gas milage?

1995 Cougar Xr7 4.6

The never ending debate:
http://forums.tccoa.com/showthread.php?t=132847
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post #5 of 10 (permalink) Old 12-10-2010, 06:05 PM
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post #6 of 10 (permalink) Old 12-10-2010, 06:20 PM
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Quote:
Originally Posted by Mgino96tbird46 View Post
Pro: slightly more flow
Incorrect. Hollowing out the cat does not increase flow. Yes it increases cross-sectional area, but the huge void in the catalyst chamber reduces exhaust gas velocity and will disrupt the flow more than if the cat was there. The only way this increases the engine's performance is if the catalyst is plugged up and/or broken apart, thereby blocking the flow.

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post #7 of 10 (permalink) Old 12-10-2010, 07:42 PM
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I've always just taken the cats off of the car
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post #8 of 10 (permalink) Old 12-10-2010, 08:08 PM
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Quote:
Originally Posted by lowbird96 View Post
makes your exhaust sound like crap
I know it's not a Ford, but my C-1500 sounds rather good ... http://www.youtube.com/watch?v=F1y7pV7tuRg
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post #9 of 10 (permalink) Old 12-10-2010, 10:35 PM
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92's don't have OBD 2, thus don't have rear O2 sensors, thus won't throw a code.

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post #10 of 10 (permalink) Old 12-11-2010, 04:25 PM
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My advice, dump the whole 2 into 1 into 2 crap stock system and have something made. Even better yet - http://www.mandrelexhaustsystems.com/servlet/StoreFront

89 Cougar XR-7...slightly modded, 240 rwhp / 340 rwtq, Best time as of 4/22/12 = 13.11 @ 103.82, 1.78 60'
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