Porsche is hopeful that its naturally aspirated 4.0-liter flat-six engine will live on and is even investigating an evolved version with a sky-high redline of 9,500 RPM. Speaking to Australian publication Which Car , Porsche’s head of GT road car engines, Thomas Mader, said he does not think the 991.2 GT3 RS’ 4.0-liter flat-six will go away. He said they are investigating ways to improve its power and drivability, including raising its redline from 9,000 RPM to 9,500 and increasing the stroke. None of these theoretical improvements are for sure, though, with Mader saying such decisions are left to Porsche engine designers. Mader also said Porsche will “look at the things we have on (the) racetrack to put it in the street car.” This appears to further allude to the high-revving 4.0-liter engine, as the mid-engine 911 RSR’s 4.0-liter powerplant revs to 9,500 RPM and emits an unforgettable flat-six scream. Mader explained that the engine lifetime for a road car is different, though,
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