Powerflow is just a trademark... the one by me in Stafford is just a guy in a shed who knows how to weld stainless... although he is very good. Basically he uses the powerflow brand to obtain parts cheaper and then he gets more custom due to the power of the brand and its advertising... in return he pays powerlow ltd a premium for the privelage.... so in retrospect all systems will be different depending on what you specify or what materials he has... i.e. My car has an oval rear silencer made by peco but with all the powerflow custom bits on it, whereas my girlfriend has a triangular silencer that isn't branded....