The M47r engine used in the 75 is a "detuned" version of the one they fit into the BMW 3 & 5 series I believe. They won't have changed any engine parts in detuning it, that would have been far too expensive, the easiest-cheapest way to alter it would be to change the ECU set-up. so logically, adding a Ronbox only puts it back to where it was originaly or slightly better. Either way it won't cause any harm to the engine.. :lol:
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