Hi recently purchased a 350z and I'm now looking into getting it mapped, it currently has a ash mushroom air filter, modified exhaust system but I was wondering is there any way of telling if it has a plenum spacer fitted at all? It's a 2003 import just like to know if there is any measurements i can take or visual clues to tell if it has one? Sorry if this been asked before or a novice question! New to the world of z's! Thanks, Tom.