I have always been under the idea that a F.A.S.S. system does not add any power to your truck, but just gives cleaner fuel, and more pressure. But today, after i borrowed money from the bank to fill up my truck, a fellow Cummins enthusiast filling up next to me, claimed his F.A.S.S. 150 gave him a noticable increase in HP. Is this true?? And i didnt really have to borrow money to fill up....not yet anyway:$: