The 2005 and newer Charger/Magnum ZEX Blackout Nitrous System has a fuel tap adapter that replaces the factory fuel line assembly on the passenger side of the engine. Much like the Hemi truck engine, the Charger and Magnum Hemi engines also uses a high pressure, 58 psi, fuel system. Because of this, special jets are included in the kit for the optimum tuning.