I used some oil from the old CP(I ended up seeing this accumulate on the c clip which was a sure sign of a leak) when I initially installed the o-ring and it fits in the channel just fine, but when you go to slide it on the intercooler it grabs and twists leading to a boost leak. What was weird was that the connection feels really loose when you install the ring correctly, but I believe that's to allow for the metal CP and FMIC to expand.
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