Used or new, but I want it to come with all things necessary to mount it on the car. I need this to finish my set up (F21L, Neuspeed catback, 440CC, K&N, F21 TIP & Mani, 034 PCV, UM Stage 2) Help me out! :) This is for a 99 A4 B5 AEB 1.8TQM