K&N Individual Round Style Stacks for Hilborn Injectors with Blowers and Turbos - Air filters designed to fit over stock, uncut ram tube. Filter comes complete with rubber mounting adapter. To install, fit rubber adapter around ram tube base. On early screw-on ram tube type, cut adapter with razor blade and wrap around tube. Fit filter over ram tube and clamp onto adapter in desired position. Air filters come with chrome end caps. As with all K&N air filters, these are washable and reusable. Simply use K&N oil and cleaner to service your filter.