IBU's are bitterness units not so much aroma, flavor units. You can have a low IBU with a lot of hop aroma and flavor.
My last IPA I shot in around 48 IBUS for the boil, but I added 1 oz at flameout, then filtered wort through 1 oz, then dryhopped 2 oz for 7 days, then 1 oz in priming sugar...