[Mrsteno2369]

I have a 335i 07 and I want to get JB4 and I want to get the VRSF catless downpipes for my car but with the downpipes it says i could add a O2 simulator do I need that? or does the JB4 include that? Let me know please thank you!

[Mrsteno2369]

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[Turbo_power4ever]

you only need the additional o2 simulator (downpipe fix) if you need to pass an emissions test every year in the state you live in. if not, you don't need it. you will get a light on your dash though, but the jb4 has a built in feature to hide the ses light.