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During the air restriction webinar Andre mentioned posting information regarding intercooler piping sizes from his drag evo would be interested in seeing that if possible i did attempt to search for it but had no luck
Sorry I can't recall what was discussed now without rewatching the webinar. On the black evo 9 drag car we used 2.5" plumbing from the turbo to I/C and 3" from the I/C to throttle body. On my own car (blue EVO 3) we use 80 mm tube which we had to roll our selves.