HFS-2 is designed for non-crucial applications where engine power is being lost due to high ambient and poor fuel quality. Under those circumstance the ECU will retard timing and dump fuel to keep the engine safe. This system can reclaim most of those losses and in some case a small amount of boost pressure can be raised to increase power (within the safe operating limits of ECU. (gauge/flow sensor is optional extra)
	HFS3-v2 This system one of the most advanced system on the market to date. It utilises an inline valve to meter fluid flow, similar to the factory fuel injection system. It tracks the fuel flow and manifold pressure signal and coverts them to water/methanol flow. User is able to set the starting point and re-scale the incoming signals. Gauge and turbine flow sensor is standard. It monitors low flow, over flow and power cut and reduce boost automatically or switch map (on some ECUs) or both. The latest version will work with BMW N54/55 and mini R56 platforms. more info
	HFS-6 (discontinued) IDC and Manifold pressure referrenced. Same as its little brother but with added adjustability to re-curve the incoming signal freely. This is currently the flagship system and the most advanced system on the market. Three failsafe outputs are available for reducing boost, switching maps (where applicable) and overrides a manual or third party electronic boost controller. more info