i have just installed my SL 55 intake and now something happening with my Arrow of a tachometre it is on 2000 rmp when i set gear box shift on "p" or "N" position on city traffic lights. then it comes down to the normal rmp, but just i drive 10 meters then stop and again set "p" or "N" position. arrow jumps to 2000 rmp ( may be it is because of AIR add?