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Well I don't really trust the attitude when it comes to boost. I've got a mechanical gauge as well and under higher boost the edge is a lot higher. My mechanical will be 35 or 36 ish and the attitude will tell me mid 40's, which I highly doubt from a stock turbo on an 02.
I asked this question on DTR and only useful answer I got was that the edge is a boost fooler and its active even when in stock mode. I think I need to call edge and ask them.