Custom exhaust - Toyota Yaris Forums

Yoda · 01-18-2010, 09:18 PM

I am getting my exhaust done tomorrow

Few questions...
1) what pipe size? 2.5"...2.25"...2"?
2) should it be from the resonator, catalytic, or try to do header(not to excited about this one) all the way back
3) what kind a diff in whp are we talking about for crushed bent vs mandrel. I dont think it will make more than 2 whp diff at the most....

will get some pics and my new dyno

supmet · 01-18-2010, 09:22 PM

1) search, tons of threads on this, iirc 2.5 and 2.25 are for boost mostly
2) if you're going custom might as well do header back
3) your talking 2 whp total if your lucky, if you only lose one from crush bending that's half the power you were gonna make.

thebarber · 01-18-2010, 09:25 PM

just do 2" mandrel bent from the back of the resonator to the back of the car

keep the stock cat and resonator as they're 2" thru....

i replaced my res-back w/ aftermarket and got a nice bump in hp/tq. any larger and you risk losing too much bottom-end power

Yoda · 01-18-2010, 10:49 PM

did my search just making sure. didn't want to fudge it up.

its gonna cost $300 from the res... Sounds like a good price to me...

aucorium · 01-19-2010, 01:35 AM

i recon a decat should make a diff on our cars

thebarber · 01-19-2010, 08:41 AM

Quote:

Originally Posted by aucorium

i recon a decat should make a diff on our cars

i doubt it

from dyno's i've seen of other cars, removing the cat only gives 1-2whp....and thats on an engine with more displacement than a yaris

jaytown · 01-19-2010, 01:59 PM

Let us know how it turns out.

aucorium · 01-19-2010, 02:19 PM

yeah , i'll def let you guys know how it goes with a decat , i recon it could yield some more power , i mean the Renault clio sport gets quite a few horses from a decat

Jerkratt · 01-19-2010, 03:27 PM

i got 3.1 hp gain when i did my two dyno pulles... the first i had 17x7 motegies and dc sports header stock mid pipe greddy axle back vs 15x6.5 konigs and original nitto mid-pipe

i have to try and get to the place in south jersey and get them to print the 2 out so i can scan them i think it was 105 vs 108.1 or something like that i gotta get unlazy and drive down there.

Yoda · 01-19-2010, 03:32 PM

so it was $70 to get it crush bent.... I went with the $300 mandrel bent 2.25".

aucorium · 01-20-2010, 02:51 AM

ok , so the decat gained you about 3 BHP ? i suppose flow and rev response was a bit better aswell ?

Arkhangel · 01-20-2010, 08:16 AM

So Stock pipe is 2"?

1.5 · 01-20-2010, 11:23 AM

I would go 2-2.25 mandrel bent from the header back. Ive always thought about going catless but I heard it can actually ruin the engine. So I guess i would just replace stock with a high-flow racing cat.

Yoda · 01-20-2010, 12:43 PM

well this is the first step :) i want to do some testing then i will see if i will do from the header.

thebarber · 01-20-2010, 01:13 PM

Quote:

Originally Posted by Arkhangel

So Stock pipe is 2"?

2" from the header thru the resonator and it shrinks to 1.75" AFTER the resonator to the back of the car

Yoda · 01-21-2010, 09:06 PM

some random pics uploaded from my phone

1.5 · 01-21-2010, 09:34 PM

SICK!

advocate · 01-22-2010, 05:11 AM

Looks amazing Yoda! Great job!

01-18-2010, 09:18 PM	#1
Yoda Drives: 2008 Black Sedan Join Date: Oct 2008 Location: FL Posts: 966	Custom exhaust I am getting my exhaust done tomorrow Few questions... 1) what pipe size? 2.5"...2.25"...2"? 2) should it be from the resonator, catalytic, or try to do header(not to excited about this one) all the way back 3) what kind a diff in whp are we talking about for crushed bent vs mandrel. I dont think it will make more than 2 whp diff at the most.... will get some pics and my new dyno

01-18-2010, 09:25 PM	#3
thebarber daily driver View User's Garage Drives: the #wrecho Join Date: Jun 2006 Location: Grand Rapids, MI Posts: 5,877	just do 2" mandrel bent from the back of the resonator to the back of the car keep the stock cat and resonator as they're 2" thru.... i replaced my res-back w/ aftermarket and got a nice bump in hp/tq. any larger and you risk losing too much bottom-end power __________________

01-19-2010, 01:35 AM	#5
aucorium AKA Samurai Racer Drives: Yaris 2006 Join Date: Jul 2006 Location: South Africa Posts: 834	i recon a decat should make a diff on our cars __________________ JDMtuner Import Performance Tuning www.jdmtuner.co.za

01-19-2010, 02:19 PM	#8
aucorium AKA Samurai Racer Drives: Yaris 2006 Join Date: Jul 2006 Location: South Africa Posts: 834	yeah , i'll def let you guys know how it goes with a decat , i recon it could yield some more power , i mean the Renault clio sport gets quite a few horses from a decat __________________ JDMtuner Import Performance Tuning www.jdmtuner.co.za

01-19-2010, 03:27 PM	#9
Jerkratt View User's Garage Drives: 08 Yaris Liftback S (RIP 07) Join Date: Apr 2007 Location: Fair Lawn, NJ Posts: 1,378	i got 3.1 hp gain when i did my two dyno pulles... the first i had 17x7 motegies and dc sports header stock mid pipe greddy axle back vs 15x6.5 konigs and original nitto mid-pipe i have to try and get to the place in south jersey and get them to print the 2 out so i can scan them i think it was 105 vs 108.1 or something like that i gotta get unlazy and drive down there. __________________ "It hurts more when its wet"

01-18-2010, 09:22 PM	#2
supmet Banned View User's Garage Drives: 2007 4 Door Yaris Join Date: Jan 2009 Location: Southern California Posts: 1,357	1) search, tons of threads on this, iirc 2.5 and 2.25 are for boost mostly 2) if you're going custom might as well do header back 3) your talking 2 whp total if your lucky, if you only lose one from crush bending that's half the power you were gonna make.

01-18-2010, 10:49 PM	#4
Yoda Drives: 2008 Black Sedan Join Date: Oct 2008 Location: FL Posts: 966	did my search just making sure. didn't want to fudge it up. its gonna cost $300 from the res... Sounds like a good price to me...

01-19-2010, 01:59 PM	#7
jaytown Drives: Yaris Join Date: Dec 2009 Location: Costa Mesa, CA Posts: 30	Let us know how it turns out.

01-19-2010, 03:32 PM	#10
Yoda Drives: 2008 Black Sedan Join Date: Oct 2008 Location: FL Posts: 966	so it was $70 to get it crush bent.... I went with the $300 mandrel bent 2.25".

01-20-2010, 02:51 AM	#11
aucorium AKA Samurai Racer Drives: Yaris 2006 Join Date: Jul 2006 Location: South Africa Posts: 834	ok , so the decat gained you about 3 BHP ? i suppose flow and rev response was a bit better aswell ? __________________ JDMtuner Import Performance Tuning www.jdmtuner.co.za

01-20-2010, 08:16 AM	#12
Arkhangel View User's Garage Drives: 2007 Yaris Sedan Join Date: Nov 2006 Location: Puerto Rico Posts: 399	So Stock pipe is 2"? __________________ The difference between fiction and reality? Fiction has to make sense. --Tom Clancy

01-20-2010, 11:23 AM	#13
1.5 Form>Function Drives: 07 Flint Sedan Join Date: Dec 2009 Location: Tampa Posts: 4,018	I would go 2-2.25 mandrel bent from the header back. Ive always thought about going catless but I heard it can actually ruin the engine. So I guess i would just replace stock with a high-flow racing cat. __________________ Instagram: @southernstreets_phil Facebook.com/southernstreetsempire

01-20-2010, 12:43 PM	#14
Yoda Drives: 2008 Black Sedan Join Date: Oct 2008 Location: FL Posts: 966	well this is the first step :) i want to do some testing then i will see if i will do from the header.

01-21-2010, 09:34 PM	#17
1.5 Form>Function Drives: 07 Flint Sedan Join Date: Dec 2009 Location: Tampa Posts: 4,018	SICK! __________________ Instagram: @southernstreets_phil Facebook.com/southernstreetsempire

01-22-2010, 05:11 AM	#18
advocate Drives: car Join Date: Oct 2008 Location: location Posts: 1,033	Looks amazing Yoda! Great job!

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