Bit of a hint from personal experience... I ran my MY11 with a turboback exhaust and no tune for over a week, experienced absolutely no problems at all. Was told that the air sensors in the later models can detect it pretty well and that i shouldn't have any trouble with it untuned... I got it tuned anyway to be on the safe side, although i did still run it fairly hard before it was tuned and it seemed completely fine!
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