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Discussion Starter #1
Hello everyone

Is there a long header brand that fits a y pipe with cats?
if so..
will it trip CEL if you install all sensors ?
 

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If it is the OEM y-pipe all the headers would fit. I recommend URD Headers the difference It´s a lot, I would be posting a before and after dyno chart tomorrow of those headers.
 

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Discussion Starter #3
If it is the OEM y-pipe all the headers would fit. I recommend URD Headers the difference It´s a lot, I would be posting a before and after dyno chart tomorrow of those headers.
Thanks for replying

What year is your FJ?

Does it trigger check engine light though?

And... Good luck on dyno :)
don't forget posting the results.
 

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Thanks for replying

What year is your FJ?

Does it trigger check engine light though?

And... Good luck on dyno :)
don't forget posting the results.
Mine is 2012 and it did not tigger the check engine light, I bought the URD O2 Simulators too and everything is fine.
 

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Discussion Starter #7
yes it will if you dont add the URD O2 Simulators because it removes the front set of cats
It will trigger indeed if you used your stock y pipe since the location of the rear o2 sensors is in front of the second set cats.
Thus same flow will go through front + rear sensors
this state will throw a code.

Read my last comment the one before this one
 

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Hello everyone

Is there a long header brand that fits a y pipe with cats?
if so..
will it trip CEL if you install all sensors ?
Hey did you find the answer to this question? I'm out here in Abu Dhabi wondering the same thing. I'd like to upgrade the exhaust and keep at least one set of catalytic converters. I'm interested to know what you found out.
 
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