Nemesis was only really loud after they changed the wheels that time, other than that it seems pretty average.
Colossus at Thorpe Park!; Especially loud next to the cobra roll, If you order something at the Hot DOgs & Nachos place you can't hear anything :lol:
Pepsi Max Big One; In the queue to Infusion it is particualrly notable!
And the noises that Boomerangs come out with such as Station brakes, the brakes on the hill before the return and the thud it makes when the train is released are also loud; Well they are on Wipeout.
Other than that can't think of any others :?