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dondiemand
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dondiemand

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2003 Toyota Celica

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So Cal
May 30, 2:02pm - #19379 
removing the cat

im trying to search the forum about removing the cat but couldnt find one..anyway, has anyone tried this? did you notice any gain? im thinking about removing the resonator and the cat to squeeze out more juice..any opinions?

oops! my bad, this should be under the Custom Mods section, somebody kindly move it there..thanks a lot!

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Spread Eagle
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South Sweden
May 30, 2:15pm - #19380 
Removing the cat will give you around 7-10 hp. Atleast that is what ppl say here.



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dondiemand
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So Cal
May 30, 2:19pm - #19381 
wow! eek really??!! the only down side is it's illegal here in so cal..that's why im kinda iffy about it

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South Sweden
May 30, 2:30pm - #19382 
LOL. Illegal here to. But since when do cops do look under your car. grin



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Steven
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Riverside, CA
May 30, 2:34pm - #19383 
it sounds like shi*. it is pretty loud and you will get a check engine light because of the O2 sensors (2).

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dondiemand
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dondiemand

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So Cal
May 30, 2:37pm - #19384 
steven, have you tried this before? how about replacing it with a high flow cat? will it make any difference?..or maybe i should just take my resonator off, huh

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Steven
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May 30, 2:42pm - #19385 
cut the resonator off, weld pipe in place.

get high flow cat and weld it in place of the OEM cat.

with these 2 mods, you'll notice a considerable gain in performance.

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dondiemand
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dondiemand

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2003 Toyota Celica

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So Cal
May 30, 2:55pm - #19386 
great! i'll take your word for it! thanks steven cheers

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Steven
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May 30, 3:21pm - #19387 
don't get a ticket and get caught with a cat-less exhaust by the CHP, there is a heafty fine for that.

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Evan
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May 30, 3:22pm - #19388 
Quote:
cut the resonator off, weld pipe in place.

get high flow cat and weld it in place of the OEM cat.

with these 2 mods, you'll notice a considerable gain in performance.


Wouldn't a cheaper (and just as effective) alternative be to just hollow out the oem cat, after welding pipe in place of the resonator? That way you don't have to buy a high flow cat. Anyone have thoughts on this?


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Street Prototype
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May 30, 4:41pm - #19389 
if you remove the cat plus the resonator and overall is a straight pipe, you will here the POPping noise and its very annoying, very loud as well but the gain is noticable BUT you might get pulled over for that...

removing the CAT and replacing it with a resonator is what i did on mine and it sounds sweet plus the gain...

i will take pictures of it very very soon, so standby thumbsup

by the way, trust me on this one, i experimented on my exhaust a lot before rice


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Evan
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May 30, 4:59pm - #19390 
Quote:

removing the CAT and replacing it with a resonator is what i did on mine and it sounds sweet plus the gain...


Interesting.. do you have emissions testing where you live? and if so, how are you going to pass? deal


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element_celica
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Michigan
May 30, 6:41pm - #19391 
if you remove the cat, won't the check engine light come on because of the 02 sensors?
i really hate seeing those check engine lights.
will the light still come on if you take out the resonator and replace the stock cat with a high flow cat? i was just looking at my exhaust pipes today and wanted to put a straight pipe in, but my friend told me about the 02 sensors and check engine light, that makes me not want to replace the cat... but i need more info about high flow cats


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tomsgts
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indiana
May 30, 7:37pm - #19392 
you can replace the cat with straight pipe just put the o2 sensors in the pipe because they are a important part in how your engine runs and you need them

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Bradcelica
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KC, MO
May 30, 10:15pm - #19393 
yes, i believe you can have the o2 sensors welded onto ur straight pipe(someone will correct me if i'm wrong cheers)... you can also get a universal high flow cat and have the sensors welded onto it grin thumbsup

here is random technology's web site, they have a universal high flow cat that will fit our celis
randomtechnology


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Street Prototype
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May 31, 2:50am - #19394 
no engine check light, no emission testing here, and the 02 sensor is not connected to the catalytic converter, check under your car and see if theres an o2 sensor connected to the cat converter, the o2 sensor is located before the catalytic converter commin down from the headers, if you can see yours connected on the cat converter, hmmmm thats weird but mine is not there...

like i said, ill post pics very soon...


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element_celica
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Michigan
May 31, 7:06pm - #19395 
cool..so if you put a straight pipe to replace the cat and the resonator, will there be that ricey pop sound coming from the exhaust? kuz i dont want that, and i want to take the cat out to free up the exhaust system.
hmmm whats a resonator for anyway? to quiet down the exhaust noise?


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Street Prototype
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Jun 1, 1:49am - #19396 
Quote:
cool..so if you put a straight pipe to replace the cat and the resonator, will there be that ricey pop sound coming from the exhaust? kuz i dont want that, and i want to take the cat out to free up the exhaust system.
hmmm whats a resonator for anyway? to quiet down the exhaust noise?


the resonator serves to quiet down the sound, but when you have straight pipe all the way, yes you will have the pop sound and its totally gay, i had a straight pipe before but now im using the resonator as a cat converter


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element_celica
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Michigan
Jun 1, 8:22am - #19397 
Quote:
Quote:
cool..so if you put a straight pipe to replace the cat and the resonator, will there be that ricey pop sound coming from the exhaust? kuz i dont want that, and i want to take the cat out to free up the exhaust system.
hmmm whats a resonator for anyway? to quiet down the exhaust noise?


the resonator serves to quiet down the sound, but when you have straight pipe all the way, yes you will have the pop sound and its totally gay, i had a straight pipe before but now im using the resonator as a cat converter


so you took the cat converter out and replaced it with another resonator? and you left the stock resonator too?
i've heard of people hollowing out the cat convertor also... how's that done?


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Street Prototype
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Jun 1, 4:19pm - #19398 
Quote:
Quote:
Quote:
cool..so if you put a straight pipe to replace the cat and the resonator, will there be that ricey pop sound coming from the exhaust? kuz i dont want that, and i want to take the cat out to free up the exhaust system.
hmmm whats a resonator for anyway? to quiet down the exhaust noise?


the resonator serves to quiet down the sound, but when you have straight pipe all the way, yes you will have the pop sound and its totally gay, i had a straight pipe before but now im using the resonator as a cat converter


so you took the cat converter out and replaced it with another resonator? and you left the stock resonator too?
i've heard of people hollowing out the cat convertor also... how's that done?


this will explain everything thumbsup

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Steven
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Riverside, CA
Jun 1, 4:34pm - #19399 
JD - look at my edit of your photo... isn't that "sensor" the cat? Is your mid-pipe stock? On the mainland, we have an O2 sensor before the cat and one after the cat.

Linked Image

This is a picture of my mid-pipe... no resonator. O2 sensors not are on the other side of the piping...

Linked Image

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element_celica
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Michigan
Jun 1, 7:50pm - #19400 
what happend when you took out that sensor? did your check engine light come on? did you just take it off, or you cut the wires ?


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Bradcelica
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KC, MO
Jun 1, 8:02pm - #19401 
i'm going custom; i have an obx racing muffler (with removable silencer). i'm about to have the resonator ripped out and have a 2 1/4" mid pipe put in. is the stock cat really that restrictive?? i'm not gonna yank the cat due to emissions, but if the stock cat is real restrictive then i'm gonna buy a universal random technology cat.


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eNinja
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san antonio, texas
Jun 1, 10:25pm - #19402 
i wish i saw this thread a while back. i guess its been a while since ive checked the site. anyways. i did this mod. i removed the cat and the res and straight piped it to my TRD exhaust. it sounded horrible. hes right about the popping sound. i hated it so much, i paid another 60 bucks to have it put back but the shop damaged my o2 sensors in the process. my car sounds fine again but it runs crappy and i get the check engine light all the time. ive been in the process of getting them to replace it for MONTHS now. i threatened to sue them but hopefully i wont have to (its my friends dads shop). ive also been asking people to get me a set of used o2 sensors. theyre 150 bucks a pop at the dealer. i want some off a used gts. anywho, good luck.

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Steven
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Riverside, CA
Jun 2, 12:31am - #19403 
i'm going to get a straight pipe made for me for track purposes only smile

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Street Prototype
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Jun 2, 4:07am - #19404 
Quote:
JD - look at my edit of your photo... isn't that "sensor" the cat? Is your mid-pipe stock? On the mainland, we have an O2 sensor before the cat and one after the cat.

Linked Image

This is a picture of my mid-pipe... no resonator. O2 sensors not are on the other side of the piping...

Linked Image


Sorry Steven but i have to correct you on this one, that is not the catalytic converter, look at the pic below...

Linked Image
Linked Image
Linked Image

Toyota Celica Catalytic Converter 1986-1989
Linked Image
Toyota Celica Catalytic Converter 1981-1983
Linked Image

the old celicas have the O2 seonsors on their cat converter, our cars O2 sensor is separate...

the illustration i have with the resonator replaced is the cat converter.

our cat converter is a bolt on type, the one your talkin about on my illustration you edited is not a bolt on type, thats why we have Universal High Flow Cat converter so we can replace it if we want too... cheers




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Miicha
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GeRmAnY
Jun 2, 6:07am - #19405 
Hey Street Prototype

Can you get a sound byte of what your exhaust sounds like now or do you know where I can find one? I want to straighten out my resonator pipe too, but i wanna hear what it sounds like B4 i do it. I would really appreciate it.

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Street Prototype
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Jun 2, 2:09pm - #19406 
sure buddy, heres the video clip of my exhaust thumbsup

Click Here


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Miicha
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GeRmAnY
Jun 3, 7:37am - #19407 
KOOL KOOL I WANT IT!!! I WANT IT!!! rofl goodjob goodjob grin

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tWiSteD
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Marietta, GA
Jun 3, 7:54am - #19408 
thats a very nice exhaust! thumbsup

however, for you people thinking about the straight pipe system, i have a friend that tried it on his teggy, and got caught like the first week when he wasn't even racing. 4,000 dollar fine. could've put in a supercharger for that! spineyes


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Miicha
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GeRmAnY
Jun 3, 8:03am - #19409 
That sucks...but in DC i have heard louder... and they do not get pulled over..

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Steven
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Riverside, CA
Jun 3, 10:39am - #19410 
yea CHP will not like you if you get caught cat-less

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