I had so called nitrous guru's go over my truck and never find the nitrous system,the only give away was the bottle pressure gauge on the pillar. Bottle was under an old suitcase behind the drivers seat,and nobody ever thought to lift it in an old guys truck,all the lines were disguised to look like factory lines.Was invited out to a street get together,and the truck sat for an hour with the hood open,and nobody ever spotted the nitrous on it,and when we went out to spot,somebody asked who all was spraying,and a couple guys made the comment they didn't think anybody was,i sure as hell wasn't gonna correct them,lol