gutting downpipe

IggDawg · Post by **IggDawg** » Mon Dec 30, 2002 11:18 pm

any reason I can't just take the downpipe off and drill/smash/crush/push/generally eliminate the cat? Everyone raves about new dp's, and I'm not getting inspected for another year now. on top of that I've heard of people running catless passing inspection. Anyways, are there any dangers from gutting the downpipe other than risking speeding tickets?

Post by **Legacy777** » Tue Dec 31, 2002 3:25 am

no.....not that I can tell...

Aaron's ej22t · Post by **Aaron's ej22t** » Tue Dec 31, 2002 8:27 am

I would not recommend it. the cat material is dangerous stuff from what i have heard. you don't want to be grinding that up. i recommend you either spring for a custom dp or an aftermarket one.

LegacyT · Post by **LegacyT** » Tue Dec 31, 2002 10:58 am

Just get a custum one done or get a prefab like the HKS for 150 bucks or so, and keep the stock downpipe around. You never know in your area it might not pass emissions. Or if you sell the car the new owner may want it returned to stock. Then what? You'd have to shelve out for a new or used stock downpipe which would be $$'y.

Mark,

omahasubaru · Post by **omahasubaru** » Thu Jan 02, 2003 4:38 pm

I have a question for you guys with aftermarket catless down pipes... Does your ECU through any CEL codes or anything from taking the cats out... or does the OBDI not have issues with this?

Thanks - Jon

boostjunkie · Post by **boostjunkie** » Thu Jan 02, 2003 4:54 pm

No CE lights, no driveability problems.

Post by **Legacy777** » Thu Jan 02, 2003 5:45 pm

As mentioned, OBD1 computers don't have a second O2 senser for cat efficiency. So no you won't get any CEL's

IggDawg · Post by **IggDawg** » Thu Jan 02, 2003 5:51 pm

so we just have the one wide-spectrum cat? schweet.

-IggDawg

Post by **Legacy777** » Thu Jan 02, 2003 8:22 pm

no.....we have the one wide spectrum O2 sensor

boostjunkie · Post by **boostjunkie** » Thu Jan 02, 2003 9:15 pm

So are you saying that I could hook up an a/f gauge to the stock o2 sensor and get some REAL values outta it?

IggDawg · Post by **IggDawg** » Thu Jan 02, 2003 9:21 pm

Legacy777 wrote:no.....we have the one wide spectrum O2 sensor

Smartass

.

eastbaysubaru · Post by **eastbaysubaru** » Thu Jan 02, 2003 10:49 pm

Good question Boostjunkie. Anyone?

-Brian

IggDawg · Post by **IggDawg** » Thu Jan 02, 2003 11:28 pm

If it's anything like the WRX wideband O2 sensor, it'll have a base voltage like 3.5V (on the WRX). A change in this voltage in either direction (IE 3.2 or 3.8 for example) would signify a leaner or richer mixture. The ECU actually reads a milliamp signal, but the information can be gathered by voltage also.

Post by **Legacy777** » Thu Jan 02, 2003 11:48 pm

The FSM gives the following info.

At idle, the O2 sensor should read between .1 - 1.0 V

(MT) 1.0 V would signify rich mixture
(MT) 0.2 V would signify lean mixture

(AT) 0.7 V would signify rich mixture
(AT) 0.0 V would signify lean mixture

boostjunkie · Post by **boostjunkie** » Fri Jan 03, 2003 10:10 pm

Hmmmm, those numbers seem similiar to the values given for my obd-2 o2 sensor in the GT . . . Now I gotta figure out what the bosch wideband o2 sensor outputs are . . .

Anybody know?

legacycentral bbs

A forum for 89-94 BC-BF(BJ) Legacy Owners and Fans

gutting downpipe

gutting downpipe