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Cats or Not


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Discussion Starter #1
I went today to find out the bad news about my CEL. Turns out one of my cats are dead leading me to the questions.

Would there be any side effects, to gutting the cats? Plus do the MIL Eliminator kits work for our cars? I an leaning towards yes.

Second question, the high flow cats, do I have to modify anything to use them? I know they need to be welded. And if I were to do that would I need 3 cats or would I be able to get away with two?

Third question, Sound. I have heard some cars that sound like crap without the cats. So with stock manifolds, no cats, and true duals (Mid Mount Muffler DI-DO) is what I am planning to do at the moment. I dont want to do it and not like it so I am getting all the info I can. I have searched and havent found any vids that are still working.

Thanks in advance!!!!!
 

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Would there be any side effects, to gutting the cats? Plus do the MIL Eliminator kits work for our cars? I an leaning towards yes.
Yes. By gutting the cats you leave a huge empty space in the exhaust, and what happens is when the exhaust pulse is travelling, it hits that empty chamber and the velocity of the gasses plummets. This is bad for power.

I think I remember reading that MIL eliminators became illegal to purchase. You can probably still find them or make your own, but they will work as far as preventing the CEL from coming on.

Second question, the high flow cats, do I have to modify anything to use them? I know they need to be welded. And if I were to do that would I need 3 cats or would I be able to get away with two?
You can get away with just the front 2. Replace the third cat with a y-pipe or a resonator or muffler, but again don't just leave it empty.

Third question, Sound. I have heard some cars that sound like crap without the cats. So with stock manifolds, no cats, and true duals (Mid Mount Muffler DI-DO) is what I am planning to do at the moment. I dont want to do it and not like it so I am getting all the info I can. I have searched and havent found any vids that are still working.
The cats help to cut down on the drone that would otherwise come from the exhaust. But a properly chosen resonator can fix this issue.
 

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Totally different car I know, but I gutted the cat in my Escort and it sounds like a$$ until its fully warm (like a very tinny, very bad running deisel,) and even warm it's not much better, but not near as tinny! Having a big empty chamber does make it sound funny, and like the guys said, probably isn't good for exhaust velocity (though I noticed no difference on the Escort, but its only got like 95hp!) ;)
I'd vote for the hi-flow cats or a straight pipe...
 

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Discussion Starter #6
Well my wallet takes another hit. But I figure why do it twice. Do it right the first time. High Flows it is. Thanks Peoples!!!!!
 
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