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Originally Posted by ddub
You probably understand that the more boost you pump into your engine, means the more force you are putting on you pistons and seals. So you are defenitly wearing out the engine faster with higher boost, which is why I am satisfied with 14.5 psi at 4500ft.
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That is only the case if the turbo actually can push more, given the stock turbo size on a WRX it wont be pushing much more than hot air past 16psi at sea level, at 19psi at altitude you might want a catch can installed on the actual turbo....