The ATOMIC BOOST CONTROLLER is a single stage unit, which is great for set and forget boost level control. The ATOMIC boost controller was tested on an MY02 Subaru WRX, (only mods were a cat-back exhaust) back to back with the factory controller. It instantly improved mid range performance by 18KW (23HP) at the wheels, at 1500 RPM earlier. This is the result of the turbo being able to spool much earlier and stronger, but still within the factory boost limit. You can expect similar results on most vehicles. Available in Black, Blue and Silver.