Takeing out the Catalatic converter

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Takeing out the Catalatic converter, What kind of gains?

Sep 13, 2004 - 8:19 PM
Guest_DJMC_Celica_* Guest_DJMC_Celica_* View Member Profile	Just like the topic says, or is this a BADDDD Idea?

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Sep 15, 2004 - 10:54 AM

97sccelica

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QUOTE (Kwanza26 @ Sep 14, 2004 - 10:56 PM)

QUOTE (97sccelica @ Sep 15, 2004 - 6:29 AM)

i'm speaking from experience, on my dad's 98 civic DX coupe, it had the kind of exhaust manifold with built in cat. one of the runners cracked, so we took it off and replaced it with a 4-2-1 header i bought off of ebay.

car got louder, and pulled harder through all the rpms

also, went from 32mpg to 34mpg(he drove 80 miles a day round trip to work)

since i took my cats out of my wrx, i have noticed slightly better mpg. not that i am technically getting more per tank, its just that i push the car a little harder and still get the same milage.

That's completely different though... Removing the pre-cat in the header is not "removing the cat" like say under the car, which this topic reffers to. Even if you remove the cat from the exhaust manifold, the manifold still will not make gains because of the size of the space where the cat used to be. Exhaust manifolds in n/a trim are pretty picky about flow and velocity when it comes to actually making some power. That's why a header is needed... and of course, a header will make some positive gains in most cars.

As for your WRX... its mix in this discussion is not accurate mostly because being Turbo charged... it will see gains from exhaust flow modifications while n/a motors usually do not always see gains...

i get what youre saying, had i gutted the cat in the manifold, the car wouldnt have had a noticable change

but i am pretty sure that was the only cat on my dad's car, in fact, it was, and the dealer wanted like $900 for it.

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Posts in this topic

DJMC_Celica Takeing out the Catalatic converter Sep 13, 2004 - 8:19 PM

OOBE It's not going to be a very noticeable differe... Sep 13, 2004 - 8:24 PM

DJMC_Celica Bad idea though? Sep 13, 2004 - 8:25 PM

97sccelica QUOTE (DJMC_Celica @ Sep 13, 2004 - 5:25 PM) Bad i... Sep 13, 2004 - 8:26 PM

rjbibeau ohh man that was the best cheapest mod that i have... Sep 13, 2004 - 8:33 PM

rjbibeau and it doens't smell like rotten eggs becuase ... Sep 13, 2004 - 8:34 PM

Doge your cat was probably melted and clogged... If you... Sep 13, 2004 - 8:39 PM

rjbibeau actually it wasn't at all i was quite surprise... Sep 13, 2004 - 8:41 PM

Shigexile would this pass the emission test? Sep 13, 2004 - 8:59 PM

Kwanza26 QUOTE (Shigexile @ Sep 14, 2004 - 1:59 AM) would t... Sep 13, 2004 - 9:23 PM

Yota But wouldn't that help your gas mileage a litt... Sep 13, 2004 - 9:40 PM

Kwanza26 QUOTE (Yota @ Sep 14, 2004 - 2:40 AM) But wouldn... Sep 13, 2004 - 9:46 PM

rjbibeau here in minnesota they took away the emission test... Sep 13, 2004 - 10:35 PM

raz128 A lot of the us UK guys are finding a de-cat pipe ... Sep 14, 2004 - 4:54 AM

DJMC_Celica Well...even if you know someone that will pass you... Sep 14, 2004 - 7:10 AM

Anub1s I was told by a guy who owns an emissions and safe... Sep 14, 2004 - 11:11 AM

DJMC_Celica Well thats what im doing they are running a whole ... Sep 14, 2004 - 11:25 AM

Supersprynt QUOTE (Kwanza26 @ Sep 13, 2004 - 10:23 PM) QUOTE (... Sep 14, 2004 - 12:40 PM

kevstir Made a huge diference to my car , the low down tor... Sep 14, 2004 - 12:53 PM

97sccelica QUOTE (Supersprynt @ Sep 14, 2004 - 9:40 AM) QUOTE... Sep 14, 2004 - 2:06 PM

shid QUOTE (kevstir @ Sep 14, 2004 - 5:53 PM) Made a hu... Sep 14, 2004 - 2:19 PM

DJMC_Celica Well the shop guy just called me, and said its nea... Sep 14, 2004 - 2:21 PM

shid QUOTE Well the shop guy just called me, and said i... Sep 14, 2004 - 2:25 PM

DJMC_Celica He's not, i allready asked him! Sep 14, 2004 - 2:30 PM

Kwanza26 QUOTE (Supersprynt @ Sep 14, 2004 - 5:40 PM) what ... Sep 14, 2004 - 2:32 PM

shid QUOTE (Kwanza26 @ Sep 14, 2004 - 7:32 PM) QUOTE (S... Sep 14, 2004 - 2:35 PM

SlowCelica94 I took my resinator out and regret it. Untill my c... Sep 14, 2004 - 3:27 PM

kevstir QUOTE (shid @ Sep 14, 2004 - 12:19 PM)QUOTE (... Sep 14, 2004 - 7:18 PM

Anub1s Its just the way shid is.....he likes to argue for... Sep 14, 2004 - 7:31 PM

shid QUOTE (Anub1s @ Sep 15, 2004 - 12:31 AM) Its just ... Sep 14, 2004 - 9:42 PM

Jaws4God so taking out the resonator makes it sound bad? w... Sep 14, 2004 - 10:25 PM

rjbibeau i took out the resonator out all that it does it m... Sep 14, 2004 - 10:54 PM

rjbibeau just gut the primary cat out don't let these d... Sep 14, 2004 - 10:56 PM

97sccelica QUOTE (shid @ Sep 14, 2004 - 6:42 PM) Look, taking... Sep 15, 2004 - 1:29 AM

Kwanza26 QUOTE (97sccelica @ Sep 15, 2004 - 6:29 AM) i... Sep 15, 2004 - 1:56 AM

Uppitycracker Removing the cat is environmentally irresponsible.... Sep 15, 2004 - 2:47 AM

DJMC_Celica hahahaha, well im pretty sure im not going to lose... Sep 15, 2004 - 8:58 AM

97sccelica QUOTE (Kwanza26 @ Sep 14, 2004 - 10:56 PM) QUOTE (... Sep 15, 2004 - 10:54 AM

rjbibeau when we refer to cat we're of course talking a... Sep 15, 2004 - 11:08 AM

Kwanza26 QUOTE (97sccelica @ Sep 15, 2004 - 3:54 PM) i get ... Sep 16, 2004 - 6:47 PM

psyko what about high flow cats, they do anything? Sep 16, 2004 - 9:04 PM

shid QUOTE (psyko @ Sep 17, 2004 - 2:04 AM) what about ... Sep 17, 2004 - 12:22 AM

raz128 My 2 pence.... The De-Cat pipe, in my opinion, is ... Sep 18, 2004 - 7:38 PM

kevstir im going to get my car on the rolling road very so... Sep 18, 2004 - 8:31 PM

shid QUOTE (raz128 @ Sep 19, 2004 - 12:38 AM) I assume ... Sep 19, 2004 - 1:45 AM

raz128 QUOTE (kevstir @ Sep 19, 2004 - 1:31 AM) Raz was ... Sep 19, 2004 - 9:18 AM

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