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Discussion Starter · #1 ·
I live in a city where they check OBDII codes for emissions testing and will soon be the proud owner of an IS300. What can I do without tripping the check engine light? Any chance that replacing the Y-pipe will be OK? I already plan on exhaust and intake.

Has anybody done an Altezza Beams 3sg swap?

Thanks Guys.
 

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intake (3rd gen Injen, 2nd gen AEM), exhaust,

the header and the y are the where the cats are which will throw on ur CEL
 

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you may need to explain what CEL is to him.
 

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Discussion Starter · #8 ·
Ya, it's called a Check Engine Light, anymore brainbusters?

I've been around Toyotas for quite a while, just haven't had any experience with the IS yet.
 

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Replacing or removing your rear cat will not trip a check engine light, because bank1 and bank2 sensor 2 (rear most o2 sensors) are placed BEFORE the rear cat. Thus, they will register the exact same readings even after removal of the cat.

A header WILL throw a CEL, as it removes the primary cats, and now sensor 2 (rear o2 sensor) will be sniffing untreated air, resulting in an "emissions below threshold (p0300)" check engine light.

Hope this clears up some of the confusion and misinformation.

-Chris
 
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