Stock K16 upgrade using our new lightweight billet compressor wheel with a 52/65 mm spec (spec 2 is newest and larger compressor of the two), ideal for track /road course applications. Optional custom set Turbosmart  wastegate springs . Good for up to 700hp with other power adders. Good k16 core required. Not only  one of our clients ran a record time of 5.87 sec. in 60 to 130 mph, but also a world record  1/4 mile time of 10.41 second @ 134.66 mph on race gas.  You are buying a pair of turbos please select 1 in shopping cart.