This may be a stupid question but how do you gut your cat and what are the advantages and disadvantages?

 

take it off, get a rod and screw driver, go to town on it. Just ram it all out. It will be louder and better flowing.

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89 camaro 305 tbi, flomaster 3 chamber cat back, gutted cat, Edlebrock TES Headers, Exhaust cutout, Edlebrock open element, 160 degree T-stat, and a Stage 2 FastChip.

2 kicker comp 12"'s, polk for the rest. Phoenix gold xs2300 to subs, kicker impulse 404XI to 4 speakers, pioneer DEH- P7000R head unit, and finally a 12 disc changer. Full leather interior from http://www.MrMikes.com

 

Thanks Mike,I thought there was more to it

 

Remember we all breathe the air your tailpipe spits out.

 

There are a dew disadvantages though. I recently did the method above and wow. I had an already loud exhaust, but now this thing was just deafening, even in the car. You will have a small low end power loss with taking off the cat and gain a few hp on the high end. This contrary to how it may sound is usually a good combo on these cars since the low end torque usually overwhelms the tires too much and there is not enough high end. What you really need to do is put some sort of pipe through the cat after you gut it. I assume you are leaving it on the car for visual inspection. Getting a pipe through can be quite difficult believe it or not. I had a high flow 3 inch that I gutted and could not get a 3 inch pipe through. A 2 3/4 might work, I had a piece of 3 that I took a 1/4 inch out of the middle and squeezed it through which took quite a while, you may have better luck. When I was done though, the exhaust really quieted down and seemed to just flow better overall. Good luck. On the other hand, if you're not at all worried about emissions just put a pipe in it's place. One more thing, some people have trouble with getting their exhaust hot enough to work the O2 sensor after gutting the cat, make sure it is working right afterwards. Good luck.

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87 GTA 350 L98
K&N filter, beefed up TH-700r4, Accel Manifold, Superram, Fuel Press. Regulator 49.5psi, air foil, modified MAF, SLP cold air box, Accel 24lb Injectors, Hypertech Thermomaster chip w/160 thermostat, MSD 6AL and Blaster 3, B&M shift kit & megashifter, Moser Ford 9in Rear with Richmond 3.50 and locker, Edlebrock TES headers and Cat Back,Gutted cat, removed emissions, Hotchkis setup in rear, Poly suspension and Koni in the front, relocated MAT, bypassed TB coolant

 

when i did it it was pretty hard tring to get it off the y pipe. I hooked it to a pully and to a tree and pulled really hard and hit it with a really big hammer for 15 minites and it finaly came off. is there a easyer way? I want to see how it is without my exhaust but i dont want to do the same thing i did with the cat tring to get it off the little grove that the clamp made.

 

Ya,I'm going to gut it tommorw,but getting the cat of the y pipe is going to be a pain in the a$$.Any better way to do get the cat of the Y pipe?

 

cut it off

 

So just putting holes in the cat will give better high end HP? Also Do i have a high flow cat? everything is stock.

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92 Camaro 305 TBI. Everything stock so far except a shift kit.

Future mods. Spark plug wires and plugs, tint, Cutting off cat and new 3inch pipes. Maybe putting 2 glass paks for effect. any other advise on getting to 300+ HP would be appreciated. Thanks

[This message has been edited by 92Camaro305TBI (edited June 13, 2001).]

 

no you do not have a high flow cat. When it is empty it flows much better. I put a slit in the inlet pipe on my cat and bent back the tabs, then the y-pipe came off easily.

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89 camaro 305 tbi, flomaster 3 chamber cat back, gutted cat, Edlebrock TES Headers, Exhaust cutout, Edlebrock open element, 160 degree T-stat, and a Stage 2 FastChip.

2 kicker comp 12"'s, polk for the rest. Phoenix gold xs2300 to subs, kicker impulse 404XI to 4 speakers, pioneer DEH- P7000R head unit, and finally a 12 disc changer. Full leather interior from http://www.MrMikes.com