There upgrades include new turbochargers , and intercoolers. Source : Switzer Performance Blog
These new turbochargers utilize Garrett GT ball-bearing center sections and custom compressor wheels with the most applicable aero profile for this combination. These turbos not only produce the airflow needed to meet our performance targets, they also offer the best intial and transient boost response as well. This is hugely important for road course and street use. Along with the intercooler and plumbing package we have developed, this combination has the best thermal capacity we have produced on a platform to date. Our pressure drop through the entire system was less than .05 psi... virtually no pressure drop. While the cores can flow up to 1057hp worth of air, we are experiencing no loss in response from the combination. During our 4th gear runs on the dyno, our charge air temps would rise only 1 degree F max. Now that's efficiency!
Source : Switzer Performance Blog