DMS 4.5" to 6" Billet Velocity Stack DMS 4.5" to 6" Billet Velocity Stack – CNC Machined Intake Transition Maximize airflow and performance with the DMS Billet Velocity Stack, designed to transition a 4.5” intake tube to a massive 6” air filter inlet with smooth,... MSRP: Was: Now: $89.99 Add to Cart