What makes this comparison interesting is the 981 Boxster S and the 991 Carrera both have the same basic 3.4 liter motor but with different tunes. The 991 Carrera with 345 horsepower and the Boxster S with 311 horsepower. Porsche does not give the Boxster the 3.8 liter unit in the 991 Carrera S to protect it so it is logical to use the 991 Carrera instead as we all know the Carrera S is faster.
In the 1/4 mile the Carrera runs a email@example.com to the Boxster S firstname.lastname@example.org. As stated, Porsche protects the Carrera. It would be great to see this race again with the Boxster not handicapped by a tune intentionally designed to hold it back but with equal power. If that were the case, this race result would likely be reversed with the Boxster winning. But Porsche can't allow that now can it as 911 owners have very fragile egos.
The Road Course is really the place where a Boxster can show the 911 its taillights namely if it is a tighter course with a handling and balance over power focus. The 991 Carrera used for the comparison did not have any of the additional options that may help such as PASM (Porsche Active Stability Management), Sport Chrono, or PDK. The Boxster on the other hand has all the performance options except for PDK as both cars are traditional manuals.
So what is quicker around the track? Well, in this comparison the Carrera wins with a laptime of 46.3 seconds to the Boxster's 47.4. Yes, that is a very short laptime and the road course used is basically a small oval with a couple turns thrown in. Not the best choice in tracks to use to compare as with the multiple straightaways and long sweepers the power advantage of the 991 will dominate. The 991's power and acceleration advantage, not handling, won this test.
This was a fairly good comparison and certainly much, much better than the terrible ClK63 Black Series versus C63 Black Series comparison Car and Driver posted last month which did not even include laptimes or a drag race. This is a large improvement but it would be nice to see a more technical roadcourse with a professional driver in both to make the laptime portion more significant.
Either way, hopefully Porsche stops protecting the 911 the way it does and allows the Boxster to evolve to what it can be. Which is likely to result in the best Porsche since the 911 itself.