The V-2 Si-Trim is now the standard in A&A Corvette supercharging systems. This new supercharger is equipped with enhanced high-performance compressor stages, allowing for greater airflow, boost pressure and power gain potential. These new compressors are a product of Vortech's latest research and development process. The Si-Trim is capable of operating at a peak efficiency of 78% - an impressive 6% improvement over the S-Trim's already class-leading performance. Not only does a more efficient supercharger produce a cooler air charge, it also allows for reduced engine load which results in greater net horsepower and torque gains. Note: Custom PCM Programming Required