I am the very happy owner of my first cossie saph (wife wouldn't let me get a 3door/escos) the problem is kids. No seriously when i got the car it would boost to 30psi an hold it but i can't remember what the boost gauge said on idle at that time now the car will only boost to 20 or so psi but i have noticed the boost gauge reads -9psi on idle not sure but think it read 0psi on idle before any help would be great thanks