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Old 10-17-2000, 08:40 PM   #1
DarkLite
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Member#: 2005
Join Date: Aug 2000
Location: orangeburg ny usa
Vehicle:
98 Vw Jetta VR-Sex
Cool White...

Post REplacing both cats with high flow cats?

will the check engine light still come on?
will u see just as much hp gain as with one cat and a straight pipe..

also will it be better for emmissions?
thanx

DL
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Old 10-17-2000, 08:45 PM   #2
XT6Wagon
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Member#: 524
Join Date: Nov 1999
Location: WA
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04 STi
White

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You could replace both cats with a single high flow 3way.

Jegs sell them for $52 in a 2.5" inlet and outlet.
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Old 10-17-2000, 11:01 PM   #3
wistful
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2004 STi
Java Black Pearl

Post

who is Jegs?

Don

p.s. back to the original question.. will the CE light turn on?
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Old 10-18-2000, 05:17 AM   #4
ColinL
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Location: Wichita, KS and Whoring, OT
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'01 Erion CBR 929

Post

Jeg's is a mail order company like Summit, only they've been around longer and stock more parts intended solely for drag racing.
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Old 10-18-2000, 06:27 AM   #5
XT6Wagon
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Location: WA
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White

Post

yup, thier websire is www.jegs.com
but its mainly there for ordering a free catolouge.

Thier phone number is 1-800-345-4545

I have tried summit, but every time I call they have this attitude of "why do you want to do that? Why don't sell that and get a mustang, then call us back." They don't say it but they sure do think it.

Jegs however I have only once encountered a salesman who though it was cool that someone would be modifing a "strange" car, and would look through any thing they had to get info I needed, and if they didn't have it they would tell me who to talk to at the Part's manufacturer.
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Old 10-18-2000, 06:41 PM   #6
Patrick Olsen
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Location: Where the Navy sends me...
Vehicle:
1997 Legacy 2.5GT
QuickSilver Metallic

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The check engine light uses inputs from the two O2 sensors - one before the cats, one after (or in between them, I can't remember). If the ECU senses that the cats are not doing their job well enough, then it will turn on the check engine light. As long as you install a good hi-flow cat, and keep the before and after O2 sensors, you should be just fine.

(Or at least that's the way I understand it).

Pat Olsen
'99 Legacy 2.5GT 5speed sedan (RIP)
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Old 10-18-2000, 06:59 PM   #7
RidinLow
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Pat, I guess from your sig that the Leg was totaled?
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Old 10-18-2000, 07:08 PM   #8
WRXwannbe
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Location: Long Beach, CA, USA
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1997 Impreza L/WRS
WRB

Post

or you could put the O2 sensors in simulation mode with some electrical wiring. I've heard of this but don't know what one would need to do. But it is doable not possible (possible could mean theoreticly, I would strive away from that).
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Old 10-18-2000, 07:15 PM   #9
ColinL
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Location: Wichita, KS and Whoring, OT
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'03 Evo, Rice White
'01 Erion CBR 929

Post

Someone tried to wire a dummy load on the 2nd oxygen sensor on a 98+ and it didn't work. They theorized that the system was actually smart enough to look for fluctuation in the signal.

The 1st oxygen sensor is absolutely critical-- it must be installed for the car to run properly. However, it doesn't care if there are catalysts or not...

[This message has been edited by ColinL (edited October 18, 2000).]
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