Weapon-R intake systems are CNC mandrel bent out of 6061 aluminum, and then hand TIG welded to ensure a positive seal and proper fitment. The 02-07 WRX & STI intake system is carefully tuned by matching the EJ's displacement and air intake capacity with airspeed to the intake systems tube size and length for maximum performance output. The Dragon filter features a computer CAD designed and flow bench tested velocity stack, which greatly increases airflow and air volume into the engine, therefore increasing engine performance. Dragon filters can easily be cleaned for repeated use. The Subaru short ram comes with stainless steel clamps, instructions, and all needed hardware for installation.