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Old 11-07-2008, 08:51 PM   #1
harveyjai
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Full exhaust System for NA yaris

Hi guys,

I just wanna know what would be the best combination of doing a full exhaust system for a NA yaris.

Atm, i have a bolt on muffler. I have read post saying Headers might not make too much difference. Also some of my mates told me to modify the cat or something.

What do u think is the best combination piping for a NA yaris? I wanna get the most out of my NA yaris...

I don't mine custom the whole thing, i just need some ideas.

Cheers,


Harvey
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Old 11-07-2008, 08:53 PM   #2
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Garm ( cali yaris ) sell a nitto midpipe that would work for clearing the farts out the rear end
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Old 11-07-2008, 10:53 PM   #3
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Originally Posted by Thej3sta2 View Post
Garm ( cali yaris ) sell a nitto midpipe that would work for clearing the farts out the rear end
so that is a midpipe with a bolt on muffler that you are suggesting?
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Old 11-07-2008, 11:10 PM   #4
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DC 4-2-1 Header + Nitto Midpipe + Fujitsubo Wagolis = Yes ?
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Old 11-08-2008, 02:24 AM   #5
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^ ooh, nice
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Old 11-08-2008, 10:58 AM   #6
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if we custom the whole thing, should we only use one cat? or? get rid of the cat? or?..
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Old 11-08-2008, 11:00 AM   #7
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Originally Posted by The Architect View Post
DC 4-2-1 Header + Nitto Midpipe + Fujitsubo Wagolis = Yes ?
+1

I still haven't seen the DC 4-2-1 yet, but IMO 4-2-1 is the way to go for the Yaris. WSCP sells the W*R 4-2-1 header in case you're interested.
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Old 11-08-2008, 11:11 AM   #8
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some of my friends have told me to get the 4-1 for yaris...any reason y?
if u keep u rev above 3K, 4-1 is better or 4-2-1?
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Old 11-08-2008, 11:35 AM   #9
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Originally Posted by harveyjai View Post
some of my friends have told me to get the 4-1 for yaris...any reason y?
if u keep u rev above 3K, 4-1 is better or 4-2-1?
I've heard 4-1 is better for the higher range, and 4-2-1 is better for the lower/middle ranges.
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Old 11-08-2008, 12:32 PM   #10
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Quote:
Originally Posted by harveyjai View Post
some of my friends have told me to get the 4-1 for yaris...any reason y?
if u keep u rev above 3K, 4-1 is better or 4-2-1?
The DC header mentioned above is actually a 4-1 design. There is only one 4-2-1 header available for the Yaris and is from Weapon R.

In theory a 4-1 will provide a better gain and higher rpm while a 4-2-1 will provide better gains at the mid range. The problem is that by design the Yaris header is so short that I doubt there is much difference between any of the current model available. So I would tell you to choose the one that fits your budget!

If you want the ultimate set up and still keep it legal for emission testing I will tell you to get a high flow cat Only one or at least remove the secondary cat leave the primary cat. You already have a bolt on muffler so you just need the mid pipe.
If you can get mandrel bent tubing go for 2" pipe if you can't get it, then go for 2.25" pipe.
If you want it civil, snap a round mufller/resonator in the middle in place of the OE resonator and ou are good to go!

And the header will make some difference as long as you work out the rest of the muffler. Not much gain by mating a header with a stock exhaust.
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Old 11-08-2008, 12:58 PM   #11
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Quote:
Originally Posted by CASTREX View Post
The DC header mentioned above is actually a 4-1 design. There is only one 4-2-1 header available for the Yaris and is from Weapon R.

In theory a 4-1 will provide a better gain and higher rpm while a 4-2-1 will provide better gains at the mid range. The problem is that by design the Yaris header is so short that I doubt there is much difference between any of the current model available. So I would tell you to choose the one that fits your budget!

If you want the ultimate set up and still keep it legal for emission testing I will tell you to get a high flow cat Only one or at least remove the secondary cat leave the primary cat. You already have a bolt on muffler so you just need the mid pipe.
If you can get mandrel bent tubing go for 2" pipe if you can't get it, then go for 2.25" pipe.
If you want it civil, snap a round mufller/resonator in the middle in place of the OE resonator and ou are good to go!

And the header will make some difference as long as you work out the rest of the muffler. Not much gain by mating a header with a stock exhaust.
Interesting info! Thanks CASTREX
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Old 11-08-2008, 08:25 PM   #12
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Quote:
Originally Posted by CASTREX View Post
The DC header mentioned above is actually a 4-1 design. There is only one 4-2-1 header available for the Yaris and is from Weapon R.

In theory a 4-1 will provide a better gain and higher rpm while a 4-2-1 will provide better gains at the mid range. The problem is that by design the Yaris header is so short that I doubt there is much difference between any of the current model available. So I would tell you to choose the one that fits your budget!

If you want the ultimate set up and still keep it legal for emission testing I will tell you to get a high flow cat Only one or at least remove the secondary cat leave the primary cat. You already have a bolt on muffler so you just need the mid pipe.
If you can get mandrel bent tubing go for 2" pipe if you can't get it, then go for 2.25" pipe.
If you want it civil, snap a round mufller/resonator in the middle in place of the OE resonator and ou are good to go!

And the header will make some difference as long as you work out the rest of the muffler. Not much gain by mating a header with a stock exhaust.
i've heard that seddan 08 has 2 cats and there are 2 air sensors after each cat, when you do that mod above what r u gonna do with the sensors? it will not give u CE light?
i'm asking cuz i wanna do a mod almost like this
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Old 11-09-2008, 01:19 AM   #13
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Originally Posted by t0m4s View Post
i've heard that seddan 08 has 2 cats and there are 2 air sensors after each cat, when you do that mod above what r u gonna do with the sensors? it will not give u CE light?
i'm asking cuz i wanna do a mod almost like this
Sedan = Liftback. The only difference is the axleback section. In the sedan is a little longer.

Both models come with 2 cat converters. First one just after the exhaust manifold and the other one a few inches after.
The car has 2 sensors on the exhaust the first one and the most important is in the header. You can not mess with that one. Then there is a second sensor right after the first cat. The function of that one is monitoring the functionality of the Primary (first) cat. That one can be easily tricked if you plan to go catless. There is no sensors after the second cat. Therefore you can remove that one if you want and your car won't even notice it.
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Old 11-09-2008, 04:56 PM   #14
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Originally Posted by CASTREX View Post
Sedan = Liftback. The only difference is the axleback section. In the sedan is a little longer.

Both models come with 2 cat converters. First one just after the exhaust manifold and the other one a few inches after.
The car has 2 sensors on the exhaust the first one and the most important is in the header. You can not mess with that one. Then there is a second sensor right after the first cat. The function of that one is monitoring the functionality of the Primary (first) cat. That one can be easily tricked if you plan to go catless. There is no sensors after the second cat. Therefore you can remove that one if you want and your car won't even notice it.
so when i change the header i just need to leave the sensor where it is and replace the header?
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Old 11-09-2008, 05:29 PM   #15
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Originally Posted by harveyjai View Post
I have read post saying Headers might not make too much difference.
Do you have the 1.3 litre motor or the 1.5? Do the primaries on your stock headers have the collector down at the flange or only half way down?
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Old 11-09-2008, 11:39 PM   #16
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so when i change the header i just need to leave the sensor where it is and replace the header?
Yes. You just need to unplug the sensor on the stock exhaust manifold. Take the manifold out and install the header and finally put te sensor back on the header. It should have a bung for the sensor. Pretty simple
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Old 11-11-2008, 08:15 AM   #17
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The DC header mentioned above is actually a 4-1 design. There is only one 4-2-1 header ....

Cheers, that is some useful info there!
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Old 11-11-2008, 03:21 PM   #18
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Do your stock headers look like these from a 1.3 litre Echo?


Or like these from a 1.5 litre Echo?


A guy on Ozecho has swapped the 1.5 litre manifold (the one with the longer primaries) onto his 1.3 litre and is happy with the improvement.

Last edited by rob323; 11-11-2008 at 03:52 PM.
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