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Old 01-04-2001, 12:29 PM   #1
Scooby Guru
Member#: 610
Join Date: Dec 1999
Chapter/Region: VIC
Location: Vancouver, BC, Canada
2003 Lexus IS300
Graphite Gray Pearl

Post Replacing stock cats with hi-flow cats

Emissions laws aside...the only problem would be with the O2 sensors correct? I'd throw a check engine light right? So if I have TWO hi-flow cats then I can plug in both O2 sensors and that would solve the check engine light being tripped...or does it not work that way?
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Old 01-04-2001, 04:32 PM   #2
Sean McElderry
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Member#: 526
Join Date: Nov 1999
Location: Beaverton, OR, USA
1995 Supra Turbo


You'd be better off putting a voltmeter on the two O2 sensors. Record the differences. Then install a high flow cat...or no cat. Then install a resistor in the rear O2 sensor to make it send stock-like voltages to the ECU.

In fact, someone on this board has done this. Try a search. Good luck!

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Old 01-04-2001, 06:02 PM   #3
Tim Prudence
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Join Date: Aug 1999
Location: san diego, ca USA

I replaced both my cats with a single high flow cat (and a turbo), and I have no check engine light. This is on a MY99.
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