De-cat exhaust system

[cali yaris]

a 2 year old thread sprouts to life with all-new nastiness.

[ddongbap]

Since a little Yaris is the source of all the health problems in the world.

I think the hyper mileage section needs your input guys. Get to it.

[ozmdd]

Before this gets any uglier, can any of the cat-removal advocates cite anything that shows a HP or other performance gain from running w/o a cat? Everything I've heard/seen on small-displacement, non FI motors is that its around 0.3% difference, so why bother?

[Nexus1155]

YOURE KILLING THE OZONES!!! Please save the tree vs. the 1HP gain and get yourself a better suspension setup you will benefit betterssss

[aucorium]

well , been doing research , and it seems that a full exhaust system , header and de-cat gives the @2NZFE 1300cc 9 kw more power !! dyno tested here in RSA , thats on approx 50mm exhaust , thats 12 HP , and with a dastek uniQ it jumps to 12 kw , not to bad for a 1300cc , i bet the 1500cc will do much better

[ozmdd]

Originally Posted by aucorium

well , been doing research , and it seems that a full exhaust system , header and de-cat gives the @2NZFE 1300cc 9 kw more power !! dyno tested here in RSA , thats on approx 50mm exhaust , thats 12 HP , and with a dastek uniQ it jumps to 12 kw , not to bad for a 1300cc , i bet the 1500cc will do much better

Again, not to dispute your info, but that sounds about the same as the gains I got from a CAI and an axle-back exhaust w/ an underdrive pulley. No changes to my exhaust manifold or cats/midpipe at all. I don;t think the cat gives you even 1 hp.
I'd love to see something that shows different results.

[aucorium]

Originally Posted by ozmdd

Again, not to dispute your info, but that sounds about the same as the gains I got from a CAI and an axle-back exhaust w/ an underdrive pulley. No changes to my exhaust manifold or cats/midpipe at all. I don;t think the cat gives you even 1 hp.
I'd love to see something that shows different results.

no prob buddy , remember , this is on a 1.3 , not a 1.5 , gains will differ. :-)

[YarisPR]

My dad used my Yaris (1 cat removed) to get the inspection of his Z3 (it doesn't pass inspection do to emissions) and my Yaris passed

And Yes, emissions laws here are easily bend / broken / worked around LOL

[why?]

automobile emissions are the least of anybodies problems. Seriously. Anyone who has such worries is completely clueless.

And has never been stuck behind a bus, semi, or any other large vehicle which has absolutely zero emissions reducing devices.

[ozmdd]

Originally Posted by why?

automobile emissions are the least of anybodies problems. Seriously. Anyone who has such worries is completely clueless.

And has never been stuck behind a bus, semi, or any other large vehicle which has absolutely zero emissions reducing devices.

Diesel emissions are chemically different than gasoline. Just because they are visible doens't mean they are "dirtier."

[lilredrocket]

This is true NOx is the worst thing that comes out of gasoline buring motors and is clear. Diesel does not put off NOx when burnt but does produce soot which actually settles out of the air and lands on the ground.

[hatchbackkid82]

Someone correct me if i'm wrong but i'm pretty sure the first one is the cat and the second one down is the resonator. I don't remember seeing 2 resonators and cat when i did my mid-pipe

Originally Posted by YarisPR

Does the yaris come with 2 cats and a resonator?

[BailOut]

Originally Posted by why?

automobile emissions are the least of anybodies problems. Seriously. Anyone who has such worries is completely clueless

That has got to be the most clueless statement I've read on YarisWorld this week, and that says a lot.

Have you ever experienced acid rain? Have you ever had your taxes used to clean up both the economic losses and ecological mess it leaves behind? Does it not bother you that these things are attributed to premature deaths and higher cancer rates?

Is it not totally ridiculous that these things are easily preventable, are mandated to be prevented, that we are all given the tools on our OEM builds to do just that, and that some incredibly selfish people choose to remove those protections for no quantifiable reason whatsoever?

Some may wish it wasn't a big deal. Some may wish we didn't have to live with it. Some may wish that what they do doesn't affect others. But we're all old enough to realize that wishing something doesn't always make it so.

[posaunemeister]

Originally Posted by hatchbackkid82

Someone correct me if i'm wrong but i'm pretty sure the first one is the cat and the second one down is the resonator. I don't remember seeing 2 resonators and cat when i did my mid-pipe

Yeah, that's what I thought, too. I don't know what the whole double-cat talk is all about. I've only seen one that precedes the resonator.

My former Suzuki Reno HB had two cats and a resonator. The first cat immediately came after the exhaust header and before the flex-pipe and the other cat (which actually looked like a resonator) lead into the true resonator. But yeah, I only noticed one cat...

[ddongbap]

It goes CAT o2BUNG CAT RESONATOR.

[why?]

Originally Posted by BailOut

That has got to be the most clueless statement I've read on YarisWorld this week, and that says a lot.

Have you ever experienced acid rain? Have you ever had your taxes used to clean up both the economic losses and ecological mess it leaves behind? Does it not bother you that these things are attributed to premature deaths and higher cancer rates?

Is it not totally ridiculous that these things are easily preventable, are mandated to be prevented, that we are all given the tools on our OEM builds to do just that, and that some incredibly selfish people choose to remove those protections for no quantifiable reason whatsoever?

Some may wish it wasn't a big deal. Some may wish we didn't have to live with it. Some may wish that what they do doesn't affect others. But we're all old enough to realize that wishing something doesn't always make it so.

Acid rain wasn't caused by automobile exhaust. It was caused by many many different things. First and foremost was factory smokestacks with zero filters.

Guess what? They can't do that any more. Now factories have to spend lots of money on filters for their smokestacks.

No matter what anyone does to a Yaris, its emissions can never compare to a bus, or a semi, or even a light truck. All of which has emissions that are not regulated in the cases of busses or semi's, or are less regulated in the case of light trucks.

Blaming acid rain or any environmental problems on passenger automobiles is simply moronic, or it is used as a tool to control the mass public, and use them to suit someone's political agenda.

[ddongbap]

Originally Posted by why?

Acid rain wasn't caused by automobile exhaust. It was caused by many many different things. First and foremost was factory smokestacks with zero filters.

Guess what? They can't do that any more. Now factories have to spend lots of money on filters for their smokestacks.

No matter what anyone does to a Yaris, its emissions can never compare to a bus, or a semi, or even a light truck. All of which has emissions that are not regulated in the cases of busses or semi's, or are less regulated in the case of light trucks.

Blaming acid rain or any environmental problems on passenger automobiles is simply moronic, or it is used as a tool to control the mass public, and use them to suit someone's political agenda.

Don't forget SUVs. And the Prius batteries which'll burn a hole to China.

Don't forget that cows also fart.

Don't forget PETAisPITA.

[why?]

Now I have no problem with people saying clean air is important, because it is. But the technology in cars today make their emissions negligable.

I wouldn't ever personally remove my cat, because I do agree that race ones are actually better for power gains, and as was mentioned, small engines need backpressure for low end tourque.

But trying to put up the personal responsibility for the environment is just blatant hipocrisy and bs. The man who invented global warming puts out more emissions in a week then most of us do in an entire year.