I made a quick informative video on how to choose the proper size intercooler piping to achieve maximum efficiency and spool without being a restriction, This information is from gstryyder and I do not claim credit, I just feel everyone should know this information. Also please read the thread linked below it goes into all the details and variables.
Orignal forum thread: http://www.dsmtuners.com/threads/how-much-will-different-sized-intercooler-piping-flow.356270/
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Orignal forum thread: http://www.dsmtuners.com/threads/how-much-will-different-sized-intercooler-piping-flow.356270/