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The Dinan S2 boost is 15 psi, over 75% of stock. Cars with Dinan S2 tunes are considered "ok" and even installed at Dinan authorized dealerships (BMW).
So as far as engine reliability with higher boost than stock, not to worried about reliability. I have the latest TSB from BMW, I believe it mentions their tune detection method.
FYI, these hidden codes are able to be detected by the JB4 program; an OBD-II scanner will not be able to detect these codes.
Last edited by 135i_vs_; 01-08-2012 at 07:29 PM..
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