I don't know what a Turbo Dynamics DV is, it is fully recirc? If so then to make it louder, you need a open cone air filter. If that's not loud enough, you need a remap to increase the boost pressure. If that's not your thing then you need a 50/50 valve like the Turbosmart Kompact Dual Port, louder still? Then you'll want near £300 to spend on an atmospheric HKS SSQV which I believe is one of the only atmos BOVs that the 1.8t gets on with.