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Well i dont know if any boxster engine is capable of hitting redline in 5th gear cause the Max MPH that the manual has for each boxster is usually pegged at 6k rpm. In my 1997 2.5 liter boxster 5 speed, the manual states that its max MPH is 155 however with my intake filter and MAYBE desnorkling I've gotten it to 157 mph and if i recall the RPM's were in 5500 - 6000 RPM range... Just fighting the air the body needs to displace and when my foot pegged to the floor for atleast 10 more seconds, the MPH's wouldnt go any higher. So i dont think you can hit redline UNLESS you have some form of forced induction like a Supercharger or Turbocharger.
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