I just got my 3" cat-back put on and I bought a cat from Napa, a universal fit I believe. I have heard when a cat is clogged it might glow or smell like rotten eggs. Mine isn't glowing, but tonite when I got on it, I smelled something that smelled like rotten eggs. Could it get clogged that quick or is it normal when you first get a cat?

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"Rice burners are like tampons...Every pu$$y has to have one"
'86 IROC
T-TOPS, TINTED WINDOWS, BRAKE LIGHT BLACKOUTS
GM GOODWRENCH 350
EDELBROCK TES HEADERS
3" Hooker CatBack w/Aero Chamber muffler
EDELBROCK 600CFM CARB.
KN AIRFILTER
ACCEL HEI DISTRIBUTOR
160* Stat
3:73 Posi
Rebuilt 700R4
B&M Megashifter, 5" Autometer Tach w/shift lite

 

Notice any less performance out of your car?

My friends cat is plugged and it smells like rotten eggs/sulfer.

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1988 Jet Black IROC
5.7L W/ 64000 miles
Flowmaster Exhaust
Fully Loaded
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My IROC In Readers Rides
My IROC

 

Doesn't seem to have lost any performance. I guess I could G-Tech it to see how fast it is running, to see if I have lost any speed.

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"Rice burners are like tampons...Every pu$$y has to have one"
'86 IROC
T-TOPS, TINTED WINDOWS, BRAKE LIGHT BLACKOUTS
GM GOODWRENCH 350
EDELBROCK TES HEADERS
3" Hooker CatBack w/Aero Chamber muffler
EDELBROCK 600CFM CARB.
KN AIRFILTER
ACCEL HEI DISTRIBUTOR
160* Stat
3:73 Posi
Rebuilt 700R4
B&M Megashifter, 5" Autometer Tach w/shift lite

 

just gut it to make sure anyways.

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- David
88' GTA 5.7L TPI MODS---> air foil, K&N, Shift Kit, 180* therm, TB bypass, Gutted CAT, Flowmaster 80 Series

http://www.geocities.com/david_angel_16

 

That smell is absolutely normal,only noticable onder certain (humid)weather conditions,nothing to worry about!

 

I don't want to gut it, because I am about to go thru emissions for the 6th time, this being the first time with a cat. Also I just spent $160 on the install of the cat-back and I don't have any money right now to cut it off gut it and re weld it.

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"Rice burners are like tampons...Every pu$$y has to have one"
'86 IROC
T-TOPS, TINTED WINDOWS, BRAKE LIGHT BLACKOUTS
GM GOODWRENCH 350
EDELBROCK TES HEADERS
3" Hooker CatBack w/Aero Chamber muffler
EDELBROCK 600CFM CARB.
KN AIRFILTER
ACCEL HEI DISTRIBUTOR
160* Stat
3:73 Posi
Rebuilt 700R4
B&M Megashifter, 5" Autometer Tach w/shift lite

 

How do ya gut a CAT anyhow I mean what does that involve??

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Just take the cat off, and take a long screwdriver or something and jam out all the internals, looks like honeycomb stuff. This way it's like a straight pipe, yet it's still their for visual emissions.

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"Rice burners are like tampons...Every pu$$y has to have one"
'86 IROC
T-TOPS, TINTED WINDOWS, BRAKE LIGHT BLACKOUTS
GM GOODWRENCH 350
EDELBROCK TES HEADERS
3" Hooker CatBack w/Aero Chamber muffler
EDELBROCK 600CFM CARB.
KN AIRFILTER
ACCEL HEI DISTRIBUTOR
160* Stat, just switched to 180* b/c of winter coming and going to college in the mts.
3:73 Posi
Rebuilt 700R4
B&M Megashifter, 5" Autometer Tach w/shift lite

 

hey that sounds easy is there anything I should notice or not do when doing this....

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How do you take it off? Isnt it welded?

 

A lot of Cats are just bolted on... If it's welded on then it's not so easy (obviously). There's not much you can do to mess up the process of gutting a cat, just make sure you get all the pieces of honeycomb out... you may need to readjust the carburetor after this is done, but there should be a slight gain in power... but it will probably not provide more than 1-2 Hp more than a high flow cat would... it's main benefit is that it is a free upgrade over stock.

Once you do it, don't go to any of the nosey shops in town to get it inspected, because if they knock on the cat they will know it's gutted... I provide this information only for educational purposes... I don't want to encourage anyone

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1984 Firebird - Daily driver, 305 LG4, T5 - Hurst short shifter, Edelbrock 600 CFM Performer Carb + Intake - Edelbrock Pro-Flow air filter, gutted cat, IROC 16x8 Wheels, AIWA bargain basement (from Sears of course) CD player, Eight-ball shift ****
Check out my ride here - My $1300 Toy

"IT'S SNOWING! TO THE HIGH SCHOOL PARKING LOT!" - The Mustang and Firebird face off in the dead of winter.