bluelines:
TB993tt:
andrew34:
Can someone explain: if this plenum resolves a simple design flaw - intake air hitting a straight wall as opposed to being split and directed giving a claimed increase in power, why don't Porsche fit it as standard?
Because Porsche engineers are not the brighest, and they don't have a massive array of R&D tools to test this sort of thing - accurately.......
It is not a design flaw and it is the same with the engine maps (which you can improve by re-programming the ECU), the stock exhaust (which you can improve by a less restrictive exhaust), the stock suspension (which you can improve with a set of Bilstein dampers), etc.
The engine has simply been designed to output it's power without taking every component to it's limits. This to keep production costs down, to account for every day drivability, to keep a safety margin for reliability and, not least, because the Porsche Motorsport or Exclusive divisions already provide most of these components at a premium cost. The X51 package is a good example. There you get a more optimal plenum for a huge premium.
Alternatively, you can get a race plenum for your 911 from Porsche Motorsport which, not surprisingly, has a very similar design to the IPD plenum.
So, not only the Porsche engineers are bright, their marketers and production mangers are bright too 
Could you explain the X51 part?
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08 PORSCHE Turbo Cabriolet, 06 Ferrari F430, 04 Durango HEMI, 04 Harley Davidson Screamin Eagle, 93 Harley Davidson Nostalgia
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