High Flow Catalytic Converter - Page 2 - Toyota Yaris Forums

severous01 · 05-15-2009, 01:21 AM

i had a 383 stroker with stock manifolds, stock y pipe dual cats and aftermarket exhaust...ran almost failing for PA emissions. i put on long tubes and a SINGLE CAT from random tech and i got waaay better emissions. HC and NOX went way down, not so much on CO2 tho, and co wasnt much lower but they werent bad to begin with.

i understand what you're saying about 'physics' and i only bought the cat because it was 'emissions legal' and i didnt believe it. but the numbers proved it, and the sound did too.

now i dont know how they did it and i also dont know if it was much power added vs the LT header install, but i passed emissions with a stroker motor, and a cam motor with no problems with this cat. so i'm game if i can afford another

the bad side to this cat is simple...it's extremely expensive vs the magnaflow high-flow cat. it's like 400 bux vs 30

jbracefan1977 · 05-20-2009, 08:25 AM

you could always try the magnaflow 54305. I have it installed and I love it, they are cheaper on ebay but I wanted a warranty (the salt on the roads here in winter kills an exhaust) so I got it here magnaflow 54305 , or you can try one of the vendors http://www.allexhaust.com/magnaflow/, they are always running sales/specials. either way its a great system and very easy to install. good luck

severous01 · 05-20-2009, 11:59 AM

carsound on ebay sells them for like 35 bux and shipping...anywhere from 1.5" diameter to 4" diameter

all stainless construction, ceramic honeycomb with catalyst coated. you can also order any type of direct fit through them but you'll pay the price. universals are much cheaper and you could always cut off the factory ends and have them welded onto the magnaflow cat.

CanadianYaris · 08-08-2015, 07:15 PM

Did the high flow cat cause any check engine lights to come on. To pass emission testing where i am there cant be any check engine lights.

Rigaud · 08-08-2015, 08:26 PM

4-2-1 as header then OBX 2.25" as exhaust with muffler from OBX. I cut and installed a Magnaflow free flow 12" cat, 6" diameter Mag. free-flowing muffler cut shorter to fit and as a resonator. Got no cel popping up and second season.

Bluevitz-rs · 08-09-2015, 09:13 AM

Has anyone here ever actually flow tested the stock cat or does everyone assume an aftermarket one flows better?

05-20-2009, 08:25 AM	#20
jbracefan1977 Drives: 2007, Meteorite Join Date: May 2009 Location: Kansas Posts: 17	you could always try the magnaflow 54305. I have it installed and I love it, they are cheaper on ebay but I wanted a warranty (the salt on the roads here in winter kills an exhaust) so I got it here magnaflow 54305 , or you can try one of the vendors http://www.allexhaust.com/magnaflow/, they are always running sales/specials. either way its a great system and very easy to install. good luck Last edited by jbracefan1977; 03-24-2010 at 04:03 PM.

08-08-2015, 08:26 PM	#23
Rigaud Drives: 2009 Yaris Join Date: Jan 2014 Location: Rigaud, Quebec, Can. Posts: 357	4-2-1 as header then OBX 2.25" as exhaust with muffler from OBX. I cut and installed a Magnaflow free flow 12" cat, 6" diameter Mag. free-flowing muffler cut shorter to fit and as a resonator. Got no cel popping up and second season. __________________ 2009 Toyota Yaris (Little toy) 2002 Audi A4 Avant Quattro 3.0L (Big boy toy) 1998 Subaru Legacy GT 2.5 (winter & DD)

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05-15-2009, 01:21 AM	#19
severous01 Drives: 2008 yaris, stripped, red Join Date: Jan 2009 Location: SE Texas Posts: 977	i had a 383 stroker with stock manifolds, stock y pipe dual cats and aftermarket exhaust...ran almost failing for PA emissions. i put on long tubes and a SINGLE CAT from random tech and i got waaay better emissions. HC and NOX went way down, not so much on CO2 tho, and co wasnt much lower but they werent bad to begin with. i understand what you're saying about 'physics' and i only bought the cat because it was 'emissions legal' and i didnt believe it. but the numbers proved it, and the sound did too. now i dont know how they did it and i also dont know if it was much power added vs the LT header install, but i passed emissions with a stroker motor, and a cam motor with no problems with this cat. so i'm game if i can afford another the bad side to this cat is simple...it's extremely expensive vs the magnaflow high-flow cat. it's like 400 bux vs 30

05-20-2009, 11:59 AM	#21
severous01 Drives: 2008 yaris, stripped, red Join Date: Jan 2009 Location: SE Texas Posts: 977	carsound on ebay sells them for like 35 bux and shipping...anywhere from 1.5" diameter to 4" diameter all stainless construction, ceramic honeycomb with catalyst coated. you can also order any type of direct fit through them but you'll pay the price. universals are much cheaper and you could always cut off the factory ends and have them welded onto the magnaflow cat.

08-08-2015, 07:15 PM	#22
CanadianYaris Drives: Future 2008 Yaris Hatch Join Date: Jul 2015 Location: Ontario, Canada Posts: 16	Did the high flow cat cause any check engine lights to come on. To pass emission testing where i am there cant be any check engine lights.

08-09-2015, 09:13 AM	#24
Bluevitz-rs 1NZ-6spd View User's Garage Drives: '05 6-Spd Vitz RS Join Date: Oct 2008 Location: Oshawa, Ontario, Canada Posts: 2,967	Has anyone here ever actually flow tested the stock cat or does everyone assume an aftermarket one flows better?