http://www.theturboforums.com/content/157-TheTurboForums-com-complete-Turbocharging-guide here is some light reading to get you started. maximum boost by corky bell is a good read as is forced induction performance tuning by a. bell. both of them can be downloaded as a pdf for free, just gotta search google. there isnt much in any of them about blowthrough setups but there is tons and tons of useful info.