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Comes with a small, medium and large insert. A friend of mine installed the same defouler with no insert and doesn't seem to have any issues.
 

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Most people use the medium insert, which is what I did. I never tested to see if the other inserts did anything though as I didn't throw a code except for once due to running a tad bit of E85 in my tank without an E30 tune at the time.
 
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I read somewhere on here to use the medium insert also.
 

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Piggyback question-what insert is everyone/anyone using for BT? Efr 6758 catless specifically, or any other BT. Gotta get the 2 o2 monitors to ready and it's not working with the medium or small inserts so far.


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Medium insert is what I used. Ran the far on a stock tune for a few days with a catless downpipe and all emissions monitors were ready.
 

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How do I check if both o2 monitors are showing ready?

I used the medium insert.
Go to the troubleshooting menu in the AP and then go to check readiness monitors and scroll down.
 

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Oxygen sensor says NOT READY. Hmm...
It takes a while to read ready, you are fine. If it throws a code after reading ready(which will also light up the check engine light) then you have an issue.
 
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