DIY: replacing o.e. cat with a high flow - Toyota Nation Forum : Toyota Car and Truck Forums
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post #1 of 48 Old 11-27-2007, 10:31 AM Thread Starter
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Thumbs up DIY: replacing o.e. cat with a high flow

PIPE

Your cat is a restriction on your exhaust system

solution: put in a high flow cat...but wait your broke like me...what do you do?

weld your own

materials:
2.5 inch pipe about 2 feet
header paint of your choice

tools:
welder tig/mig/arc/torch(i have a mig)
14mm wrenches and socket maybe even that tool that gets stripped nuts/bolts out
an angle grinder with a cut off wheel x2

1. jack the car up and secure it in place.
2. remove the cat from the car.
3. lay the cat next to the pipe to get the approximate length the pipe should be
ex:


4.now that you cut the pipe to what you need. cut the flanges off the cat.
5.bolt the flanges back on the cars exhaust system.
6.try to fit the pipe in place if need be cut it down a little.
7. now here comes the welding. tac it in place in several places.
8. remove it from the car and weld all around to keep it secure and leak free.
ex:

9. when your satisfied paint it if you wish (all i had was gold paint)
ex:


10. put it back on the car and tighten it using new bolts.
11. turn the car on to make sure there are no leaks.
ex:

12. lower car and go for a test run.

my car has a nice hollow tone to it like a g35 or murano with a borla exhaust. no raspyness and if need be i can replace the cat.

my car spec:
1994 toyota camry v6se 1mzfe 6coilpacks SRI two cheapy mufflers that are about 24inches each.


edit:
as of the moment my check engine light is on but it's for other reasons but yeah it will throw another code.


^ 1994 Camry 5speed V6 SE Turbo
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Last edited by 2wickedtoyz; 11-27-2007 at 11:08 AM.
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post #2 of 48 Old 11-27-2007, 10:38 AM
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nice man what about codes? did u get o2 simulators for the down stream one?
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post #3 of 48 Old 11-27-2007, 11:06 AM
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its gonna need an O2 sensor bung, but yeah .... thats a DIY Test Pipe for ya (not really hi-flow cat, since its not a catalytic converter at all)

oh, and none of you guys with visual smog inspections can do this, unless youre going to have a 2nd set of flanges so u can put the cat back on

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Last edited by Venom_5; 11-27-2007 at 11:07 AM.
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post #4 of 48 Old 11-27-2007, 11:10 AM Thread Starter
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why would i need an o2 sensor bung? or are you talking about if i wany to put a wide band o2 sensor. i can do that later.


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post #5 of 48 Old 11-27-2007, 11:24 AM
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Quote:
Originally Posted by Venom_5 View Post
its gonna need an O2 sensor bung,
the down stream sensor in actually on teh cat-back, after the cat section. so he should be good but it would still prolly throw a code.
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post #6 of 48 Old 11-27-2007, 11:26 AM
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Quote:
Originally Posted by 2wickedtoyz View Post
why would i need an o2 sensor bung? or are you talking about if i wany to put a wide band o2 sensor. i can do that later.
Quote:
Originally Posted by bigbird View Post
the down stream sensor in actually on teh cat-back, after the cat section. so he should be good but it would still prolly throw a code.
i was thinkin the O2 was on the tail-end of the cat, but you still have that part attached as bigbird has informed me

but yeah, it would be nice to have wideband (or even narrowband if youre poor)

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post #7 of 48 Old 11-27-2007, 11:35 AM
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Quote:
Originally Posted by 2wickedtoyz View Post
why would i need an o2 sensor bung? or are you talking about if i wany to put a wide band o2 sensor. i can do that later.


within 50 to 100 miles, ur likely to get a code for o2 sensor bank 1 sensor 2 malfunction.


if u get this code, which u will....u need to do one of three things..


get a REAL cat on there...

Do the Spark plug fouler mod...

or get a o2 simulator from www.urdusa.com

Blah

Last edited by Dawgz; 11-27-2007 at 11:36 AM.
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post #8 of 48 Old 11-27-2007, 11:45 AM
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agreed but what year is the car we are talking about? 94 might just get away with it



quote=Dawgz;2069299]within 50 to 100 miles, ur likely to get a code for o2 sensor bank 1 sensor 2 malfunction.


if u get this code, which u will....u need to do one of three things..


get a REAL cat on there...

Do the Spark plug fouler mod...

or get a o2 simulator from www.urdusa.com[/quote]
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post #9 of 48 Old 11-27-2007, 12:13 PM
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Nice write up!

A mig welder is a great investment.

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post #10 of 48 Old 11-27-2007, 01:16 PM
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lol

gino, you make it look so easy. which it is. if you can weld. which most of us can't. or can, but don't have a welder. lol.

but I'm adding this to the DIY stickie

HaHa

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post #11 of 48 Old 11-27-2007, 02:26 PM
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Unless you've done a before and after dyno test you have not proved that removing the CAT did anything for HP/torque. And where are you going anyway in such a hurry? But what you have done is think that air pollution is not your problem just other people's problem.
Here is a way to get better flow (if you can prove you need it) AND stay legal and still be a responsible citizen.
http://www.randomtechnology.com/

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post #12 of 48 Old 11-27-2007, 02:49 PM
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Quote:
Originally Posted by Eye8Pussies View Post
but I'm adding this to the DIY stickie
make sure when you add it to the Sticky, that you label it as "Test Pipe" not "Hi Flow Cat" ... just so the noobs dont get confused and make 100 more noob threads

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post #13 of 48 Old 11-27-2007, 03:04 PM
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Quote:
Originally Posted by Stillrunning View Post
Unless you've done a before and after dyno test you have not proved that removing the CAT did anything for HP/torque. And where are you going anyway in such a hurry? But what you have done is think that air pollution is not your problem just other people's problem.
Here is a way to get better flow (if you can prove you need it) AND stay legal and still be a responsible citizen.
http://www.randomtechnology.com/
removing the cat or putting in a highflow cat does ad power. he dont need a dyno to prove that, just simple physics. i do agree it would be polluting more.

Last edited by bigbird; 11-27-2007 at 03:13 PM.
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post #14 of 48 Old 11-27-2007, 03:10 PM
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I guess it might be different outside of Cali., but my O2 sensors (5sfe) are before and after the manifold (upstream) converter. The downstream converter has no O2 sensors on my car. Maybe I could throw in a test pipe from ebay, and swap the oem converter back in for smog checks.
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post #15 of 48 Old 11-27-2007, 03:11 PM
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this is for the v6, but it would be best to have a real converter for emissions.

Last edited by bigbird; 11-27-2007 at 03:12 PM.
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