No cat
#1
No cat
Hey guys, thinking about hollowing out my cat on my 94 lt1. Figuring I won't have many problems since most f-body guys I talk to say they do it. Just thought I'd run it by you guys first. wonders if you guys ever had any problems, bad mpg? running rich? Thanks guys!!
#4
Just so you know you will loose power. Not gain it like said unless the cat is stopped up. There is tests all over on it. If you want to gain power. You have to have a pipe welded in the cat or get a test pipe installed.
I don't know all of the details but I believe it has to do with the exhaust bouncing around inside the open cat. Hurting the exhaust flow. A simple google will bring it up.
Edit: Here is one link for you. I know it is a import. But no matter what car or motor it is still going to be the same. http://www.importtuner.com/tech/impp...ion/index.html
I don't know all of the details but I believe it has to do with the exhaust bouncing around inside the open cat. Hurting the exhaust flow. A simple google will bring it up.
Edit: Here is one link for you. I know it is a import. But no matter what car or motor it is still going to be the same. http://www.importtuner.com/tech/impp...ion/index.html
Last edited by 2fast4u88; 05-23-2010 at 06:42 AM.
#5
Ahhh ic, do you think at the end they are saying to leave the cat on for street because techincally its illegal? or because i'll get a lot worst mpg? because right now its my DD until my little cav gets up and goin. I was planning on weldin just a pipe where the cat was. Sorry might sound like stupid questions, i'm just trying to get your guy's opinions. Thanks for the comments btw!
#7
Ahhh ic, do you think at the end they are saying to leave the cat on for street because techincally its illegal? or because i'll get a lot worst mpg? because right now its my DD until my little cav gets up and goin. I was planning on weldin just a pipe where the cat was. Sorry might sound like stupid questions, i'm just trying to get your guy's opinions. Thanks for the comments btw!
#9
If the cat is good leave it. If you do headers and ory get a high flow cat. Magnaflow makes a nice one. You don't want to run on the street without a cat. You will smell raw fuel, it will burn you eyes, and you won't pass emissions.
#11
Personal experience...I've been running an off road Y pipe for years with no smell, no strange sounds, and no other problems to speak of. For dual cat cars you need to either get sims or have the rear O2's tuned out. Also, when installing the headers/Y pipe I discovered my cats had already been hollowed out by the previous owner and I had been driving it that way without even knowing it. Needless to say, the hollow factory cats made no sounds or smells to tip me off. It did explain why I had been getting intermittant SES codes for both rear O2 sensors though.....
#13
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