Originally Posted by Yooper
No. As long as you have the proper OG it won't matter.
Keep in mind that topping up with water is harder for high IBU beers due to the maximum amount of hops oils that be isomerized, but most other beers would be simple to do.
Agreed, the higher the gravity the less soluble the bittering compounds become. I am doing a turbid mashed lambic using aged hops for a side by side yeast experiment, so IBU's are out on this batch
Thanks guys for the input, didn't realize it was that easy!