down pipe question

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i'm swapping a b18c1 into my eg. i'm planning on going turbo and was wondering if the downpipe is going to be the same size as the header. i don't want to go get the pipping done and then have to change is later because the down pipe doesn't fit. if it's the same then i'll just go get the 3inch pipping done. if not then i'll just wait. let me know guys....thanks