Exhaust pipe size

[gwasabi]

Does anyone know the Stock exhaust pipe size? I was planning to do the secondary cat delete and wanted to know what size pipe i need to weld on.

[thebarber]

1.75"

pretty sure we only have one cat and the resonator after it....

and from what magnaflow was saying, the cat and res are 2" straight thru

so if youre staying n/a id just do a res-back exhaust at 2" diameter...

[cali yaris]

We have two cats (USDM). The O2 sensor is right between them, then after the 2nd cat comes the resonator.

[josevenezolano]

Yes, My Yaris is made in Japan and it has two cats.

[thebarber]

We have two cats (USDM). The O2 sensor is right between them, then after the 2nd cat comes the resonator.

oh, didnt know that...i guess i havent really looked under the car too thuroughly....

[gwasabi]

Hmmm.....REally our pipes are that small? I plan on going turbo eventually so maybe I'll just keep the cat.....plus I only have 3" extra pipe anyway. I don't think I have a resonator. I have a greddy tic so just a muffler. Maybe when I end up turboing my car I'll just delete everything and weld the muffle back on to a 3" pipe. What do you guys think?

[Split]

i can't imagine piping being expensive. its really easy to delete that second cat, and if you're really ambitious you can remove the resonator right next to it as well, you just need to weld a new hanger on the pipe after.

[gwasabi]

I don't think we have a resonator.... I thought the resonator is the part in the back right before the outlet. As far as I know it goes cat, 02 sensor, cat, resognator, then tip

right now I think mine is cat, 02 sensor, cat, muffler.

From what I know the axle back exhausts gets rid of the resonator. I dunno maybe I'll just work on a straight pipe for once i get a turbo

[Kaotic Lazagna]

Axle backs just replace the portion of the exhaust system at the rear axle. Magnaflows' "cat-back" is like my custom set up, it actually starts from the end of the resonator (resonator back).

[Kaotic Lazagna]

i can't imagine piping being expensive. its really easy to delete that second cat, and if you're really ambitious you can remove the resonator right next to it as well, you just need to weld a new hanger on the pipe after.

Piping prices depend on the material used; i.e. steel, titanium, etc, and also the method used to bend them; i.e. crush bends or mandrel bends (more expensive).

[Kaotic Lazagna]

Does anyone know the Stock exhaust pipe size? I was planning to do the secondary cat delete and wanted to know what size pipe i need to weld on.

Honestly, if you are going to delete the second cat, might as well do away with both. I was going to do that, and the shop gave me a warning that if a highway patrol pulls me over and see's that there's only one cat, then they can impound my car. But then again, how do they know that our car comes with a primary and secondary cat?

[cali yaris]

The resonator is the long tube right under the middle of the car, after the 2nd cat. The part in back before the tip is the muffler.

header - cat - O2 sensor - cat - resonator - piping - muffler - tip

Take a look at the Nitto midpipe, it simulates your stock set up:

http://shop.microimageonline.com/images/1215528516350-74736936.jpeg

[TheSilkySmooth]

I thought all lambda control cars are header-02-cat-02-cat-resonator-muff. Some people call the first 02 a mixture sensor, since ours is the megadollar 0-5volt wideband not the 0-1 v wave/pulse. You gotta measure the mixture b4 its in a cat so the ECU knows the mixture. Remember, this is a 1.5L LOW rEVVING motor not a honda vtec that spins to 7500+ A 2" DIA system is plenty too big enough to kill most power under 3500 rpm.

Sonja's Bro

[WolfWings]

The long-tube exhaust header Richard's been testing shows our engine benefits up to around 2.25" exhaust actually, for NA at least. No gains (no mention of losses either) going up to 2.5", but yeah, unless you're going turbo no reason to go over 2.25" it looks like.

[djhuddy2442]

1.75"

pretty sure we only have one cat and the resonator after it....

and from what magnaflow was saying, the cat and res are 2" straight thru

so if youre staying n/a id just do a res-back exhaust at 2" diameter...

is the 1.75 the inside or outside diameter???

[thebarber]

I.D.

[Jason@SportsCar]

The resonator is the long tube right under the middle of the car, after the 2nd cat. The part in back before the tip is the muffler.

header - cat - O2 sensor - cat - resonator - piping - muffler - tip

Take a look at the Nitto midpipe, it simulates your stock set up:



A better image to go with your description.

#1 header
#5 resonator
#10 muffler

The two cats are just ahead of the resonator in this illustration.

https://toyotapartshub.com/media/images/oe/collision/8/8327175.gif

[djhuddy2442]

so what would be the O.D. of the pipe??

[TOLMACH]

I measured mine after the resonator (straigt section between the resonator and muffler flange) to get something like 42 mm OD. So in my case the ID is way less than 1.75 inch

[cali yaris]

I don't remember the original point of the thread now. :laugh:

[djhuddy2442]

ok thanks guiys that answers my question

[CanadianYaris]

Does removing the secondary cat and resonator cause any check engine lights go on? I want to get headers and an axle-back as well.