For higher-horsepower, custom-tuned installations we recommend a tuner kit, which does not include a fuel pump, fuel injectors or ECU programmer. This requires you or your installer to provide custom calibration and the required fuel components. The V-3 Si supercharger included with the tuner kit is capable of up to 775HP on modified vehicles. Tuner kits are also available with the 1,000HP V-7 JT supercharger for high-performance racing vehicles. Call Vortech or your dealer for more information.