Both the HO and Stage II Tuner Kits utilize the patented, proven and self-contained ProCharger supercharger, a compact, 6-rib shared supercharger drive system, OEM-quality mounting brackets, and all necessary supercharger and intercooler tubes for installation onto your 4V Cobra with no major modifications to your car or engine. These kits make sense for someone wanting to perform custom tuning of the car and push the envelope in performance. Will most likely be experimenting with alternative fuels such as 93 octane, race fuel, E85 fuel, and methanol supplemental fuel. In addition, possibly changing engine components like heads, headers, exhaust, and cams for the engine. No tuning or fuel components provided.