The lighter wheels alone probably account for 1/3 the gain on the dyno and at least some of the reduction in drag times. But they are expensive! Also, funny that they mention the MS-CAI as being piece of mind that your engine won't blow up as compared to the aftermarket. I know at least one guy had his CAI taken away by the dealer and refunded and they still aren't selling any new CAI's allegedly due to the potential for lean spots. Aside from the unofficial warranty coverage with the MS-CAI, I'd feel safer having the CP-e or Cobb or even the AEM!