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I read about this on another website and wasn't that thrilled. Very little real world power increase. 30hp seems substantial but if I remember correctly the 0-60 time increase was only minimal.
That won't stop guys from buying it though. Many guys never grow out of bragging about catching the biggest fish or having the more powerful car.
I don't know why Porsche is taking so long to put out the turbo anyway.

 

what they need to do is offer a reflash that is reasonably priced.

If it's anything like the 997 x51 kit $17k for 30hp is just insane, and that doesnt include the sport exhaust that you "must have" to install the x51. Heads (no cams), engine harness, carbon airbox cover, intake manifold, reflash, and some other misc items...cool if $$ is not an option but 30hp can be achieved much easier and cheaper.

It seems the amount of X51 kits left on the shelf gave birth to the 997 GTS model and i'm sure this will the case with the 991