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Yep they do.
I've had a blown short block with my Subaru Impreza GT Turbo on them.
Oil fouled maf sensor, maf sensor fauled ECU reading, ECU puts to less fuel in related to the actual air coming in, lean mixture, knocking, bye bye piston.
DON'T DO IT on MAF based cars like the GTT or Boxster(S). I learned it the hard, $, way.
Mark.
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