The stock K16 turbochargers will flow enough air to support about 520 HP. Modified Evolution Motorsports K24 Turbochargers have larger turbine impellers to generate up to 630+HP without increased turbo lag. We hand polish the compressor housing inducer for optimal airflow and efficiency. Dyno tests have shown that the lower RPM power is not sacrificed however top end power gains are significant. The Evolution Motorsports K24 Turbochargers are the 'real deal' and ARE NOT remanufactured K16 turbochargers that many other tuners are offering. Genuine Motorsport K24 GT2 turbos are 100% bolt on direct replacement installation.