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What are your charge temps? Of course most manufacturers were forced to switch to water cooled intercoolers, which certainly helps, but would be interesting to see charge temps after repeated full throttle at 25 psi.
As far as which motors are under more stress, that's not up for argument, but most BMW owners dump their cars before the warranty runs out because they know the financial ruin often awaiting them otherwise.
I want to see compression tests at 75-100k on these newer M cars (not babied) running 25+ psi. Intakes covered in blowby are the norm. There is no free lunch. There is a price to pay running sky high boost on small displacement engines.
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