The Penland and Ecosystem are two different pipes. I do not the technical differences between the Penland and Utility pipes. But if you want a quiet one don't get either. Both are over 104-105dbs at WOT. The ecosystem did give a power increase but I wanted more. The Eco at WOT is about the same DBs as the other pipes at idle, @ 96dbs.
From what I understand the Quiet core cust the pipe down to around 98dbs and will give you near 1/2 the power, similar performance to the Ecosystem.
IMO the little gain of the ECO is no treally worth the near $300. But if that is your only option you'll have to go w/ it.