Best high flow catalytic that should pass emissions?
 

Hey guys,

I have the greddy turbo with the 2.5 turbo tony DP and DP6061 2.5 exhaust.
The final step to getting the car on the road is getting a 2.5 cat and then passing emissions.

I am looking at the high flow spun cat's, either the metal or ceramic type.

Is one better than the other?
It seems like the ceramic ones are cheaper, any idea why?

Will passing emissions be an issue with either one of these cat's?
I will probably go with the ceramic type if it will be able to pass emissions in Ontario...


Thanks for the help

any high flow cat will/should pass emissions, even a 100 cell metal core.

Same reason Windows Vista Home is cheaper than Vista Ultimate, I expect.

All else being equal, the spun metallic-core cats tend to have a lower cell-per-inch count (thus not doing quite as good a job at scrubbing the exhaust) but also a greater void ratio (more free space for gas to pass through) thus being slightly less restrictive. They also look cool.

Q: which high flow cat will pass emissions?

A: where I live there aren't emissions inspections!

do you all see the problem here?

We have had people pass emissions with one of our cats in Ontario. Heck, I live in Ontario and just passed emission with my 2000 Miata with the same cat we use on our 90-93 and 94-97 Plug and Plag Cats.

Http://www.m-tuned.com

I have a 300 cell metal core magnaflow and I pass.

I know, isn't that so terrible?? :giggle: I can relate.

I could sleep better at night if I knew I had to pass an inspection yearly...

Glad you would, I sure wouldn't.

The cat on my Protege just died. Its only $900 to replace. No big deal, right? :jerkit: With a dead cat on the car it gets 23mpg highway when its supposed to get 30.

Thanks guys,

I am leaning more towards the metal core cat'. it sounds like they are more durable.

Here is a decent link that i found while searching:

VWvortex Forums: Ceramic cat vs metal cat

Wouldn't it be cheaper to just move to a non emissions testing state? :giggle: I was being sarcastic in the last post also if you didn't catch it. the day Alabama adopts emissions testing is the day I cry like a little girl.

And why is it $900? Is it a special cat of some kind? Can find universal cats all day long for ~$300-$400.

They don't even do visual inspection of any kind in my state, yet..... Must've missed your sarcasm, its kinda hard to read if you don't know someone when you're just reading text... My bad. ;)

http://i12.ebayimg.com/08/i/001/2f/ea/4e86_1.JPG

The protege uses some gay ass converter pictured above. When I was shopping for a replacement part there were no aftermarket units I could find available and the dealer wanted an astonishingly large amount of money for one..

Instead I bought a Chinese POS stainless steel header off ebay for $99.00. It was a Pain in the ass to install and I'm sure will fail in a year, but thats why I have a welder. The car was getting very very poor mileage with the dead cat and now with the header and a "cold air" it gets 33mpg combined, did the Mitsu Evolution fix to trick the second o2 sensor and not trigger the MIL.

admittedly, eventually, one day, I'll have a cat on my Miata after I get the new motor installed, the Mazdaspeed6 however likely won't when I install an aftermarket downpipe. Those are twice the cost of the already over-priced pieces just to have a cat installed which makes no sense. A good quality 3" high flow metal core cat isn't but 150$ or so..

I'm not much of a believer that emissions equipment on vehicles really make that big of a difference. From what I've read the states which require emissions testing still have shitty air quality...

May be rules against modification of exhaust systems, but why not weld on 2 standard flanges, and use a regular cat? I've seen a lot on not being able to modify stock systems, but I don't know if this could be classified somehow as a certified after market setup or something. I don't know, never dealt with any emission thank god.

I agree on the emissions stuff. Most of the places I have been with emissions testing have had worse quality than where I live now which doesn't. Of course thats comparing high population density areas with a more spread out city like Birmingham with only 250k people in the metro area. I can see how its a good idea, but doesn't really do much. Even a car with low emissions x 1 million cars in a small area = lots of smog. Last picture I saw of large California cities still showed shit loads of smog. Of course it would be worse with no emissions standards, but its still not pretty.