Originally Posted by kawasaki00
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When it says retains O2 readiness does that mean whe the car is plugged in at the inspection station it thinks it is good to go, like the cat is still there?
You are absolutely correct! They implemented this feature in the E46 M3 for quite some time and I will say that I saw first hand, a 100% MAF-less and catless E46 M3 pass OBDII Readiness Emissions in Illinois.
There was a lot of confusion among the E46 M3 guys, but it's important you leave your post-cat O2 sensors plugged into the wire loom! Some thought they could completely remove the whole sensor, which led to a misunderstanding and some slight problems.
You're making a great decision signing up for the Group Buy! The Evolve tune is the only modification I have on my E90 M3 and I don't feel like adding much more.